{"id":2587,"date":"2016-11-11T01:48:47","date_gmt":"2016-11-11T01:48:47","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=2587"},"modified":"2024-09-02T16:34:20","modified_gmt":"2024-09-02T16:34:20","slug":"refracao-da-luz","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/raciocinio-logico\/refracao-da-luz\/","title":{"rendered":"Refra\u00e7\u00e3o da luz"},"content":{"rendered":"

Racioc\u00ednio L\u00f3gico<\/b><\/span><\/span><\/p>\n

Refra\u00e7\u00e3o da luz<\/b><\/span><\/span><\/span><\/p>\n

Como esse conte\u00fado envolve muita teoria voc\u00ea pode encontr\u00e1-lo em<\/b><\/span><\/span><\/span><\/p>\n

fisicaevestibular.com.br \u2013 \u00d3ptica Geom\u00e9trica \u2013 Refra\u00e7\u00e3o da Luz <\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

01-(UFSCAR-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Durante o dia, <\/b><\/span><\/span><\/span>uma <\/b><\/span><\/span><\/span>pessoa dentro de casa olha atrav\u00e9s do vidro de uma janela <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>enxerga o que est\u00e1 do lado de fora. <\/b><\/span><\/span><\/span><\/p>\n

\u00c0 noite, a pessoa olha atrav\u00e9s da mesma janela e enxerga sua imagem refletida pelo vidro, n\u00e3o<\/b><\/span><\/span><\/span>\"\"<\/p>\n

enxergando o que est\u00e1 do lado de fora. <\/b><\/span><\/span><\/span><\/p>\n

Assinale a alternativa que melhor explica a situa\u00e7\u00e3o descrita.<\/b><\/span><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span><\/span> O <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o <\/b><\/span><\/span><\/span>da luz no <\/b><\/span><\/span><\/span>meio externo \u00e0 janela \u00e9 maior \u00e0 noite do que durante o dia.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o <\/b><\/span><\/span><\/span>da luz no <\/b><\/span><\/span><\/span>meio externo \u00e0 janela \u00e9 menor \u00e0 noite do que durante o dia.<\/b><\/span><\/span><\/span><\/p>\n

c) Durante o dia, <\/b><\/span><\/span><\/span>a luz que <\/b><\/span><\/span><\/span>atravessa o vidro da janela, proveniente<\/b><\/span><\/span><\/span> dos <\/b><\/span><\/span><\/span>objetos localizados <\/b><\/span><\/span><\/span>no <\/b><\/span><\/span><\/span>exterior da casa, \u00e9 muito mais intensa que a luz refletida pelo vidro da janela, proveniente dos objetos no interior da casa.<\/b><\/span><\/span><\/span><\/p>\n

d) Durante o dia, <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>polariza\u00e7\u00e3o da luz no vidro da janela \u00e9 positiva <\/b><\/span><\/span><\/span>e permite que se <\/b><\/span><\/span><\/span>enxergue o lado de fora.<\/b><\/span><\/span><\/span><\/p>\n

e) Durante a noite<\/b><\/span><\/span><\/span>, a <\/b><\/span><\/span><\/span>polariza\u00e7\u00e3o da luz no vidro da janela \u00e9 negativa <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>n\u00e3o permite que se enxergue o lado de fora.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

02-FUVEST-SP)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>raio luminoso proveniente do ar <\/b><\/span><\/span><\/span>atinge <\/b><\/span><\/span><\/span>perpendicularmente uma esfera oca de vidro de 30 cm de di\u00e2metro. <\/b><\/span><\/span><\/span><\/p>\n

<\/a> \u00a0<\/span><\/p>\n

\"\"<\/p>\n

As\u00a0<\/b><\/span><\/span><\/span>paredes da esfera t\u00eam 6,0 cm de espessura. <\/b><\/span><\/span><\/span><\/p>\n

Considerando-se que o <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o do vidro em rela\u00e7\u00e3o ao ar \u00e9 1,5 <\/b><\/span><\/span><\/span>e que a <\/b><\/span><\/span><\/span>velocidade de propaga\u00e7\u00e3o da luz no ar \u00e9 300 000 km\/s:<\/b><\/span><\/span><\/span><\/p>\n

a) Esboce o gr\u00e1fico <\/b><\/span><\/span><\/span>da <\/b><\/span><\/span><\/span>velocidade de propaga\u00e7\u00e3o da luz, em fun\u00e7\u00e3o do tempo, <\/b><\/span><\/span><\/span>desde <\/b><\/span><\/span><\/span>momentos antes da luz atingir a esfera at\u00e9 instantes ap\u00f3s ela deixar a esfera.<\/b><\/span><\/span><\/span><\/p>\n

b) Qual o tempo <\/b><\/span><\/span><\/span>que o <\/b><\/span><\/span><\/span>raio<\/b><\/span><\/span><\/span> leva para <\/b><\/span><\/span><\/span>atravessar completamente esta esfera?<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

03-(UFJF-MG)<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>arco-\u00edris <\/b><\/span><\/span><\/span>\u00e9 causado pela <\/b><\/span><\/span><\/span>dispers\u00e3o da luz do Sol que sofre refra\u00e7\u00e3o e reflex\u00e3o pelas gotas<\/b><\/span><\/span><\/span> de <\/b><\/span><\/span><\/span>chuva <\/b><\/span><\/span><\/span>(aproximadamente esf\u00e9ricas). <\/b><\/span><\/span><\/span><\/p>\n

Quando voc\u00ea v\u00ea um arco-\u00edris, o Sol <\/b><\/span><\/span><\/span>est\u00e1:<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>na sua <\/b><\/span><\/span><\/span>frente.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>entre <\/b><\/span><\/span><\/span>voc\u00ea e o arco-\u00edris.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>em algum lugar <\/b><\/span><\/span><\/span>atr\u00e1s do arco-\u00edris.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

d<\/b><\/span><\/span><\/span>) <\/b><\/span><\/span><\/span>atr\u00e1s<\/b><\/span><\/span><\/span> de voc\u00ea.<\/b><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span>qualquer lugar, <\/b><\/span><\/span><\/span>pois n\u00e3o importa a <\/b><\/span><\/span><\/span>posi\u00e7\u00e3o do Sol.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

04- (UEL-PR)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>partir do s\u00e9culo XIII, <\/b><\/span><\/span><\/span>iniciando com o <\/b><\/span><\/span><\/span>pensador Robert Grosseteste, <\/b><\/span><\/span><\/span>os <\/b><\/span><\/span><\/span>estudos em \u00f3ptica avan\u00e7aram<\/b><\/span><\/span><\/span> sistem\u00e1tica\u00a0 positivamente, <\/b><\/span><\/span><\/span>dando origem \u00e0s explica\u00e7\u00f5es cient\u00edficas <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>respeito <\/b><\/span><\/span><\/span>das <\/b><\/span><\/span><\/span>produ\u00e7\u00f5es de fen\u00f4menos e imagens, <\/b><\/span><\/span><\/span>como \u00e9 o caso dos <\/b><\/span><\/span><\/span>estudos sobre o Arco-\u00edris e as lentes. <\/b><\/span><\/span><\/span>Sobre o <\/b><\/span><\/span><\/span>fen\u00f4meno de forma\u00e7\u00e3o de Arco-\u00edris<\/b><\/span><\/span><\/span>, considere as <\/b><\/span><\/span><\/span>afirmativas <\/b><\/span><\/span><\/span>a seguir.<\/b><\/span><\/span><\/span><\/p>\n

I. <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>Arco-\u00edris prim\u00e1rio <\/b><\/span><\/span><\/span>\u00e9 causado por uma <\/b><\/span><\/span><\/span>refra\u00e7\u00e3o e uma reflex\u00e3o dos raios de Sol nas gotas de chuva.<\/b><\/span><\/span><\/span><\/p>\n

II. <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>Arco-\u00edris aparece <\/b><\/span><\/span><\/span>quando os <\/b><\/span><\/span><\/span>raios de luz branca incidem em got\u00edculas de \u00e1gua <\/b><\/span><\/span><\/span>presentes no ar e pode <\/b><\/span><\/span><\/span>ocorrer naturalmente ou ser produzido artificialmente.<\/b><\/span><\/span><\/span><\/p>\n

III. <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>fen\u00f4meno Arco-\u00edris <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>decorrente do processo de difra\u00e7\u00e3o da luz branca <\/b><\/span><\/span><\/span>nas <\/b><\/span><\/span><\/span>gotas de chuva.<\/b><\/span><\/span><\/span><\/p>\n

IV. <\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/span>dispers\u00e3o dos raios de luz branca \u00e9 respons\u00e1vel pelo espectro de luzes coloridas <\/b><\/span><\/span><\/span>que aparecem, por exemplo, pela <\/b><\/span><\/span><\/span>passagem dessa luz por got\u00edculas de \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

Est\u00e3o <\/b><\/span><\/span><\/span>corretas apenas<\/b><\/span><\/span><\/span> as <\/b><\/span><\/span><\/span>afirmativas:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

05-(UFMG-MG) \u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>feixe de luz do Sol <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>decomposto ao passar por um prisma de vidro. <\/b><\/span><\/span><\/span><\/p>\n

O <\/b><\/span><\/span><\/span>feixe de luz vis\u00edvel resultante <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>composto de ondas <\/b><\/span><\/span><\/span>como:<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>apenas <\/b><\/span><\/span><\/span>sete frequ\u00eancias que correspondem \u00e0s cores vermelha, alaranjada, amarela, verde, azul, anil evioleta.<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>apenas <\/b><\/span><\/span><\/span>tr\u00eas frequ\u00eancias que correspodem \u00e0s cores vermelha, amarela e azul.<\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>apenas <\/b><\/span><\/span><\/span>tr\u00eas frequ\u00eancias que correspondem \u00e0s cores vermelha, verde e azul.<\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>uma <\/b><\/span><\/span><\/span>infinidade de frequ\u00eancias <\/b><\/span><\/span><\/span>que correspondem a <\/b><\/span><\/span><\/span>cores desde a vermelha at\u00e9 a violeta.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

06- (ENEM-MEC)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>grupo <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>cientistas<\/b><\/span><\/span><\/span> liderado por pesquisadores do <\/b><\/span><\/span><\/span>Instituto de Tecnologia da Calif\u00f3rnia <\/b><\/span><\/span><\/span>(Caltech), nos Estados Unidos, <\/b><\/span><\/span><\/span>construiu o primeiro metamaterial que apresentava valor negativo do \u00edndice de refra\u00e7\u00e3o relativo para a luz vis\u00edvel. <\/b><\/span><\/span><\/span>\"\"<\/p>\n

Denomina-se <\/b><\/span><\/span><\/span>metamaterial<\/b><\/span><\/span><\/span> um <\/b><\/span><\/span><\/span>material \u00f3ptico artificial, tridimensional, <\/b><\/span><\/span><\/span>formado por <\/b><\/span><\/span><\/span>pequenas estruturas menores <\/b><\/span><\/span><\/span>do que o <\/b><\/span><\/span><\/span>comprimento de onda da luz,<\/b><\/span><\/span><\/span> o que lhe d\u00e1 <\/b><\/span><\/span><\/span>propriedades e<\/b><\/span><\/span><\/span> <\/b>comportamentos que n\u00e3o s\u00e3o encontrados em materiais naturais.<\/b><\/span><\/span><\/span><\/p>\n

Esse <\/b><\/span><\/span><\/span>material <\/b><\/span><\/span><\/span>tem <\/b><\/span><\/span><\/span>sido chamado de \u201ccanhoto\u201d.<\/b><\/span><\/span><\/span><\/p>\n

Dispon\u00edvel em: <\/b><\/span><\/span><\/span>http:\/\/www.inovacaotecnologica.com.br. Acesso em: 28 abr. 2010 (adaptado).<\/b><\/span><\/span><\/span><\/p>\n

Considerando o <\/b><\/span><\/span><\/span>comportamento at\u00edpico desse metamaterial, <\/b><\/span><\/span><\/span>qual \u00e9 a <\/b><\/span><\/span><\/span>figura que representa a refra\u00e7\u00e3o da luz <\/b><\/span><\/span><\/span>ao passar <\/b><\/span><\/span><\/span>do ar para esse meio?<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

07-(CEFET-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Durante o dia, <\/b><\/span><\/span><\/span>quando um <\/b><\/span><\/span><\/span>raio luminoso solar, atravessando a camada atmosf\u00e9rica<\/b><\/span><\/span><\/span>, atinge a <\/b><\/span><\/span><\/span>polu\u00edda cidade de S\u00e3o Paulo,\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

sua trajet\u00f3ria prov\u00e1vel, devido ao fen\u00f4meno da refra\u00e7\u00e3o, <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>descrita<\/b><\/span><\/span><\/span> em uma das <\/b><\/span><\/span><\/span>figuras a seguir. <\/b><\/span><\/span><\/span>Assinale a <\/b><\/span><\/span><\/span>alternativa que representa essa prov\u00e1vel trajet\u00f3ria.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

08-(FUVEST-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O <\/b><\/span><\/span><\/span>espa\u00e7o percorrido pela luz <\/b><\/span><\/span><\/span>que incide <\/b><\/span><\/span><\/span>perpendicularmente a uma face de um cubo s\u00f3lido <\/b><\/span><\/span><\/span>feito de <\/b><\/span><\/span><\/span>material transparente, antes, durante <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>ap\u00f3s a incid\u00eancia, <\/b><\/span><\/span><\/span>\u00e9 dado, em <\/b><\/span><\/span><\/span>fun\u00e7\u00e3o do tempo, <\/b><\/span><\/span><\/span>pelo <\/b><\/span><\/span><\/span>gr\u00e1fico s x t (dist\u00e2ncia x tempo) adiante.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Determine:<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o <\/b><\/span><\/span><\/span>da luz do <\/b><\/span><\/span><\/span>meio mais refringente em rela\u00e7\u00e3o ao menos refringente.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>comprimento <\/b><\/span><\/span><\/span>da <\/b><\/span><\/span><\/span>aresta do cubo.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

09-(MACKENZIE-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>figura representa <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>corte transversal de um tanque. <\/b><\/span><\/span><\/span><\/p>\n

Quando o <\/b><\/span><\/span><\/span>mesmo est\u00e1 vazio, <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>observador O, <\/b><\/span><\/span><\/span>no ar <\/b><\/span><\/span><\/span>(n<\/b><\/span><\/span><\/span>ar <\/b><\/span><\/span><\/sub><\/span>= 1), visa o ponto A. <\/b><\/span><\/span><\/span><\/p>\n

Suponha agora o <\/b><\/span><\/span><\/span>tanque completamente cheio de um l\u00edquido de \u00edndice de refra\u00e7\u00e3o n.<\/b><\/span><\/span><\/span><\/p>\n

Determine o valor m\u00ednimo de n <\/b><\/span><\/span><\/span>que <\/b><\/span><\/span><\/span>faz o observador ver o ponto B sob o mesmo raio visual.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

10-(MACKENZIE-SP)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>raio de luz monocrom\u00e1tico <\/b><\/span><\/span><\/span>que se <\/b><\/span><\/span><\/span>propaga no ar <\/b><\/span><\/span><\/span>(\u00edndice de refra\u00e7\u00e3o = 1) <\/b><\/span><\/span><\/span>atinge a superf\u00edcie <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>separa\u00e7\u00e3o com um meio homog\u00eaneo e transparente, <\/b><\/span><\/span><\/span>sob <\/b><\/span><\/span><\/span>determinado \u00e2ngulo de incid\u00eancia, diferente de 0\u00ba.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

Considerando os <\/b><\/span><\/span><\/span>meios da tabela abaixo, <\/b><\/span><\/span><\/span>aquele para o <\/b><\/span><\/span><\/span>qual o raio luminoso tem o menor desvio \u00e9<\/b><\/span><\/span><\/span>\"\"<\/p>\n

a)\u00a0<\/b><\/span><\/span><\/span>\u00c1gua\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span><\/span>\u00c1lcool et\u00edlico<\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>Diamante\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>Glicerina\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0<\/b><\/span><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span><\/span>Vidro comum\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

11-(CEFET-MG)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A <\/b><\/span><\/span><\/span>dura\u00e7\u00e3o do dia terrestre <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>ligeiramente <\/b><\/span><\/span><\/span>____________ <\/b><\/span><\/span><\/span>devido a<\/b><\/span><\/span><\/span>___________ da <\/b><\/span><\/span><\/span>luz solar na atmosfera.<\/b><\/span><\/span><\/span><\/p>\n

Os <\/b><\/span><\/span><\/span>termos que completam, corretamente, <\/b><\/span><\/span><\/span>as <\/b><\/span><\/span><\/span>lacunas<\/b><\/span><\/span><\/span> s\u00e3o<\/b><\/span><\/span><\/span><\/p>\n

a) <\/b><\/span><\/span><\/span>menor, reflex\u00e3o.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>maior, difra\u00e7\u00e3o.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/b><\/span><\/span><\/span><\/p>\n

c) <\/b><\/span><\/span><\/span>maior, refra\u00e7\u00e3o.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/b><\/span><\/span><\/span><\/p>\n

d) <\/b><\/span><\/span><\/span>menor, absor\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

e) <\/b><\/span><\/span><\/span>maior, interfer\u00eancia.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

12-(FUVEST-SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Dois sistemas \u00f3ticos, D<\/b><\/span><\/span><\/span>1<\/b><\/span><\/span><\/sub><\/span>\u00a0e D<\/b><\/span><\/span><\/span>2,<\/b><\/span><\/span><\/sub><\/span>\u00a0<\/b><\/span><\/span><\/span>s\u00e3o <\/b><\/span><\/span><\/span>utilizados para analisar uma l\u00e2mina de tecido biol\u00f3gico <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>partir<\/b><\/span><\/span><\/span> de <\/b><\/span><\/span><\/span>dire\u00e7\u00f5es diferentes. <\/b><\/span><\/span><\/span><\/p>\n

Em uma <\/b><\/span><\/span><\/span>an\u00e1lise, a luz fluorescente, emitida por um indicador incorporado a uma pequena estrutura, <\/b><\/span><\/span><\/span>presente no tecido, <\/b><\/span><\/span><\/span>\u00e9 captada, simultaneamente, pelos dois sistemas, ao longo das dire\u00e7\u00f5es tracejadas. <\/b><\/span><\/span><\/span>\"\"<\/p>\n

Levando-se em <\/b><\/span><\/span><\/span>conta o desvio da luz pela refra\u00e7\u00e3o, dentre as posi\u00e7\u00f5es indicadas, <\/b><\/span><\/span><\/span>aquela que <\/b><\/span><\/span><\/span>poderia corresponder \u00e0 localiza\u00e7\u00e3o real dessa estrutura no tecido<\/b><\/span><\/span><\/span> \u00e9:<\/b><\/span><\/span><\/span><\/p>\n

Suponha que o tecido biol\u00f3gico seja transparente <\/b><\/span><\/span><\/span>\u00e0 luz e <\/b><\/span><\/span><\/span>tenha \u00edndice de refra\u00e7\u00e3o uniforme<\/b><\/span><\/span><\/span>, semelhante ao <\/b><\/span><\/span><\/span>da \u00e1gua.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

13-(URCA-CE)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um <\/b><\/span><\/span><\/span>raio de luz incide no ponto O, meio A, da superf\u00edcie de separa\u00e7\u00e3o entre esse meio e o meio B, <\/b><\/span><\/span><\/span>com um <\/b><\/span><\/span><\/span>\u00e2ngulo de incid\u00eancia igual a 7<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>. <\/b><\/span><\/span><\/span><\/p>\n

No <\/b><\/span><\/span><\/span>interior do meio B, <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>raio incide em um espelho c\u00f4ncavo E, <\/b><\/span><\/span><\/span>passando pelo <\/b><\/span><\/span><\/span>foco principal F.<\/b><\/span><\/span><\/span> <\/b><\/p>\n

O <\/b><\/span><\/span><\/span>centro de curvatura C do espelho,<\/b><\/span><\/span><\/span> cuja <\/b><\/span><\/span><\/span>distancia focal \u00e9 igual a 1,0m<\/b><\/span><\/span><\/span>, encontra-se a <\/b><\/span><\/span><\/span>1,0m da superf\u00edcie de separa\u00e7\u00e3o dos meios A e B. <\/b><\/span><\/span><\/span><\/p>\n

Observe a <\/b><\/span><\/span><\/span>figura abaixo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere os <\/b><\/span><\/span><\/span>seguintes \u00edndices de refra\u00e7\u00e3o: n<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0= 1,0 (meio A); n<\/b><\/span><\/span><\/span>B<\/b><\/span><\/span><\/sub><\/span>\u00a0= 1,2 (meio B).<\/b><\/span><\/span><\/span><\/p>\n

Determine<\/b><\/span><\/span><\/span> a que <\/b><\/span><\/span><\/span>distancia do ponto O, o raio emerge, ap\u00f3s a reflex\u00e3o no espelho<\/b><\/span><\/span><\/span>. Dado <\/b><\/span><\/span><\/span>sen7<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0= 0,12<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

14-(UFG-GO)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Refrat\u00f4metro<\/b><\/span><\/span><\/span> \u00e9 um <\/b><\/span><\/span><\/span>instrumento \u00f3tico utilizado para medir o \u00edndice de refra\u00e7\u00e3o<\/b><\/span><\/span><\/span> de uma <\/b><\/span><\/span><\/span>subst\u00e2ncia<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>tamb\u00e9m para determinar a concentra\u00e7\u00e3o de certas subst\u00e2ncias,<\/b><\/span><\/span><\/span> como, por exemplo, o <\/b><\/span><\/span><\/span>a\u00e7\u00facar em um fluido qualquer<\/b><\/span><\/span><\/span>. A <\/b><\/span><\/span><\/span>figura <\/b><\/span><\/span><\/span>ilustra o <\/b><\/span><\/span><\/span>prot\u00f3tipo de um refrat\u00f4metro <\/b><\/span><\/span><\/span>constitu\u00eddo por um <\/b><\/span><\/span><\/span>prisma de \u00edndice de refra\u00e7\u00e3o 1,6, <\/b><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span>orif\u00edcio no qual entra a luz de an\u00e1lise<\/b><\/span><\/span><\/span> e uma <\/b><\/span><\/span><\/span>cavidade para colocar o material l\u00edquido a ser analisado. <\/b><\/span><\/span><\/span>Nessas <\/b><\/span><\/span><\/span>condi\u00e7\u00f5es,<\/b><\/span><\/span><\/span> um <\/b><\/span><\/span><\/span>feixe de luz monocrom\u00e1tico, <\/b><\/span><\/span><\/span>ao <\/b><\/span><\/span><\/span>entrar pelo orif\u00edcio, refrata na interface prisma-l\u00edquido e atinge a escala graduada em um ponto a 4 cm da origem. <\/b><\/span><\/span><\/span>Considerando-se <\/b><\/span><\/span><\/span>que L = 12 cm e h=\u221a2 , calcule:<\/b><\/span><\/span><\/span>\"\"<\/p>\n

a) <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o <\/b><\/span><\/span><\/span>do <\/b><\/span><\/span><\/span>l\u00edquido sob an\u00e1lise.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

b) <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>menor \u00edndice de refra\u00e7\u00e3o <\/b><\/span><\/span><\/span>que esse <\/b><\/span><\/span><\/span>instrumento permite medir<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

15-(UFRGS-RS)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0No <\/b><\/span><\/span><\/span>diagrama abaixo, <\/b><\/span><\/span><\/span>i<\/b><\/span><\/span><\/span> representa um raio luminoso propagando-se no ar,<\/b><\/span><\/span><\/span> que <\/b><\/span><\/span><\/span>incide e atravessa um bloco triangular de<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

material transparente desconhecido.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

Com base na <\/b><\/span><\/span><\/span>trajet\u00f3ria completa do raio luminoso, <\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o deste material desconhecido <\/b><\/span><\/span><\/span>\u00e9<\/b><\/span><\/span><\/span><\/p>\n

(Dados: <\/b><\/span><\/span><\/span>\u00edndice de refra\u00e7\u00e3o do ar <\/b><\/span><\/span><\/span>= 1; <\/b><\/span><\/span><\/span>sen30<\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/sup><\/span>= cos60<\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/sup><\/span>= 1\/2<\/b><\/span><\/span><\/span>; sen60<\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/sup><\/span>= cos30<\/b><\/span><\/span><\/span>o <\/b><\/span><\/span><\/sup><\/span>= \u221a3\/2).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

16-(FGV-RJ)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em uma <\/b><\/span><\/span><\/span>piscina,<\/b><\/span><\/span><\/span> uma <\/b><\/span><\/span><\/span>pessoa de vis\u00e3o normal,<\/b><\/span><\/span><\/span> <\/b>sem \u00f3culos <\/b><\/span><\/span><\/span>e com <\/b><\/span><\/span><\/span>olhos abertos dentro da \u00e1gua, <\/b><\/span><\/span><\/span>enxerga <\/b><\/span><\/span><\/span>desfocada uma planta que est\u00e1 fora da \u00e1gua. <\/b><\/span><\/span><\/span>\"\"<\/p>\n

Ao <\/b><\/span><\/span><\/span>sair da piscina, <\/b><\/span><\/span><\/span>enxerga <\/b><\/span><\/span><\/span>nitidamente<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>mesma planta. <\/b><\/span><\/span><\/span><\/p>\n

A partir dessa <\/b><\/span><\/span><\/span>observa\u00e7\u00e3o,<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>sabendo que a c\u00f3rnea \u00e9 respons\u00e1vel por grande parte da capacidade <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>focaliza\u00e7\u00e3o do olho humano, <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>correta <\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>conclus\u00e3o de que os \u00edndices de refra\u00e7\u00e3o do ar, da \u00e1gua <\/b><\/span><\/span><\/span>e <\/b><\/span><\/span><\/span>da c\u00f3rnea, respectivamente n<\/b><\/span><\/span><\/span>ar<\/b><\/span><\/span><\/sub><\/span>, n<\/b><\/span><\/span><\/span>ag<\/b><\/span><\/span><\/sub><\/span>\u00a0e n<\/b><\/span><\/span><\/span>c<\/b><\/span><\/span><\/sub><\/span>, obedecem \u00e0 rela\u00e7\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

17-(UFPA-PA)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Numa <\/b><\/span><\/span><\/span>loja, s\u00e3o\u00a0vendidos aqu\u00e1rios em forma de prismas retos<\/b><\/span><\/span><\/span> com <\/b><\/span><\/span><\/span>bases em forma de \u201cL\u201d.<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>vigia\u00a0da loja gosta de assistir <\/b><\/span><\/span><\/span>uma\u00a0<\/b><\/span><\/span><\/span>grande TV plana situada numa parede distante, <\/b><\/span><\/span><\/span>na <\/b><\/span><\/span><\/span>sua frente. <\/b><\/span><\/span><\/span>O <\/b><\/span><\/span><\/span>problema \u00e9 que na\u00a0linha de visada <\/b><\/span><\/span><\/span>entre o <\/b><\/span><\/span><\/span>posto do vigia e o centro da TV h\u00e1 uma coluna atrapalhando. <\/b><\/span><\/span><\/span><\/p>\n

Um dia, o <\/b><\/span><\/span><\/span>vigia percebeu que esta coluna, <\/b><\/span><\/span><\/span>embora fosse <\/b><\/span><\/span><\/span>suficientemente larga para atrapalhar a vis\u00e3o da TV, <\/b><\/span><\/span><\/span>era\u00a0<\/b><\/span><\/span><\/span>suficientemente estreita para torna-la invis\u00edvel para ele, <\/b><\/span><\/span><\/span>mediante o <\/b><\/span><\/span><\/span>posicionamento certo de dois aqu\u00e1rios cheios de \u00e1gua. <\/b><\/span><\/span><\/span><\/p>\n

As <\/b><\/span><\/span><\/span>figuras\u00a0\u201cA\u201d, \u201cB\u201de \u201cC\u201d, <\/b><\/span><\/span><\/span>abaixo,\u00a0<\/b><\/span><\/span><\/span>mostram (em vista superior) tr\u00eas formas <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>dispor os aqu\u00e1rios entre o vigia e a TV.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ap\u00f3s<\/b><\/span><\/span><\/span> <\/b>analisar <\/b><\/span><\/span><\/span>como os <\/b><\/span><\/span><\/span>raios de luz que partem da TV (mostrados na figura) mudam <\/b><\/span><\/span><\/span>de <\/b><\/span><\/span><\/span>dire\u00e7\u00e3o<\/b><\/span><\/span><\/span> ao <\/b><\/span><\/span><\/span>passarem do ar para a \u00e1gua dos aqu\u00e1rios <\/b><\/span><\/span><\/span>e de <\/b><\/span><\/span><\/span>volta para o ar, <\/b><\/span><\/span><\/span>\u00e9 <\/b><\/span><\/span><\/span>correto concluir <\/b><\/span><\/span><\/span>que as\u00a0<\/b><\/span><\/span><\/span>disposi\u00e7\u00f5es dos aqu\u00e1rios, que permitem ao vigia observar a TV, atrav\u00e9s da \u00e1gua transparente dos aqu\u00e1rios, <\/b><\/span><\/span><\/span>como se a <\/b><\/span><\/span><\/span>coluna n\u00e3o estivesse l\u00e1, <\/b><\/span><\/span><\/span>s\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

Confira as resolu\u00e7\u00f5es comentadas<\/span><\/a><\/h3>\n","protected":false},"excerpt":{"rendered":"

Racioc\u00ednio L\u00f3gico Refra\u00e7\u00e3o da luz Como esse conte\u00fado envolve muita teoria voc\u00ea pode encontr\u00e1-lo em fisicaevestibular.com.br \u2013 \u00d3ptica Geom\u00e9trica \u2013 Refra\u00e7\u00e3o da Luz \u00a0 01-(UFSCAR-SP)\u00a0 Durante o dia, uma pessoa dentro de casa olha atrav\u00e9s do vidro de uma janela e enxerga o que est\u00e1 do lado de fora. \u00c0 noite, a pessoa olha atrav\u00e9s da mesma janela e enxerga<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2508,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-2587","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=2587"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2587\/revisions"}],"predecessor-version":[{"id":2591,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2587\/revisions\/2591"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/2508"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=2587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}