{"id":3431,"date":"2017-11-13T22:49:22","date_gmt":"2017-11-13T22:49:22","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3431"},"modified":"2024-06-29T23:59:33","modified_gmt":"2024-06-29T23:59:33","slug":"optica-vestibulares-recentes-por-assunto-2017-2016-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/optica\/optica-vestibulares-recentes-por-assunto-2017-2016-2015\/","title":{"rendered":"\u00d3ptica – Vestibulares recentes por assunto \u2013 2017 \u2013 2016 – 2015"},"content":{"rendered":"

\u00d3ptica Vestibulares recentes por assunto \u2013 2017 \u2013 2016 – 2015<\/b><\/span><\/span><\/span><\/p>\n

Princ\u00edpios da propaga\u00e7\u00e3o retil\u00ednea da luz<\/span><\/span><\/span><\/p>\n

01-(UFLA \u2013 MG \u2013 PAS \u2013 017\/019)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Na ter\u00e7a-feira, 12 de abril de 2016, o\u00a0<\/b><\/span><\/span>f\u00edsico Stephen Hawking\u00a0<\/b><\/span><\/span>anunciou que, em\u00a0<\/b><\/span><\/span>parceria<\/b><\/span><\/span>\u00a0com os empres\u00e1rios\u00a0<\/b><\/span><\/span>Mark Zuckerberg, criador do Facebook, e o bilion\u00e1rio russo Yuri Milner, sondas<\/b><\/span><\/span>\u00a0ser\u00e3o enviadas para <\/b><\/span><\/span>Alpha Centauri<\/b><\/span><\/span>, que \u00e9 o\u00a0<\/b><\/span><\/span>astro mais brilhante da constela\u00e7\u00e3o de Centauro\u00a0<\/b><\/span><\/span>e a\u00a0<\/b><\/span><\/span>terceira estrela mais brilhante do c\u00e9u visto a olho nu aqui da Terra.\u00a0<\/b><\/span><\/span>A i<\/b><\/span><\/span>deia<\/b><\/span><\/span>\u00a0faz parte <\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Starshot,<\/b><\/span><\/span>\u00a0que desenvolver\u00e1\u00a0<\/b><\/span><\/span>nanosondas min\u00fasculas\u00a0<\/b><\/span><\/span>e as\u00a0<\/b><\/span><\/span>enviar\u00e1 para o espa\u00e7o usando raios de luz, impulsionando-as a 20% da velocidade da luz.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>sistema<\/b><\/span><\/span>\u00a0de\u00a0<\/b><\/span><\/span>Alpha Centauri fica a 4,4 anos-luz de dist\u00e2ncia da Terra. \u201c<\/b><\/span><\/span>Se for\u00a0<\/b><\/span><\/span>bem-sucedida<\/b><\/span><\/span>, a miss\u00e3o pode\u00a0<\/b><\/span><\/span>chegar a Alpha Centauri cerca de X anos ap\u00f3s seu lan\u00e7amento\u201d, afirmou Hawking. Calcule<\/b><\/span><\/span>\u00a0o\u00a0<\/b><\/span><\/span>tempo X\u00a0<\/b><\/span><\/span>que a\u00a0<\/b><\/span><\/span>sonda demorar\u00e1 para chegar \u00e0 estrela Alpha Centauri.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Considere a\u00a0<\/b><\/span><\/span>velocidade da luz 3\u00d710<\/b><\/span><\/span>8<\/b><\/span><\/sup><\/span>\u00a0m\/s.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

02-(CEDERJ-RJ-2017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma c\u00e2mara escura \u00e9 constru\u00edda com uma\u00a0<\/b><\/span><\/span>caixinha c\u00fabica de aresta\u00a0<\/b><\/span><\/span>L\u00a0<\/b><\/i><\/span><\/span>= 8 cm, \u00e0 prova de luz,<\/b><\/span><\/span>\u00a0contendo um pequeno orif\u00edcio circular em uma de suas faces. A luz de uma cena passa atrav\u00e9s do orif\u00edcio e projeta uma imagem que \u00e9 registrada em um filme fotogr\u00e1fico colado na face oposta \u00e0quela que cont\u00e9m o orif\u00edcio. Suponha que\u00a0<\/b><\/span><\/span>um objeto de altura\u00a0<\/b><\/span><\/span>A\u00a0<\/b><\/i><\/span><\/span>= 2 m<\/b><\/span><\/span>seja\u00a0<\/b><\/span><\/span>posicionado a uma dist\u00e2ncia\u00a0<\/b><\/span><\/span>D\u00a0<\/b><\/i><\/span><\/span>= 4 m do orif\u00edcio da c\u00e2mara escura<\/b><\/span><\/span>, que o\u00a0<\/b><\/span><\/span>raio do orif\u00edcio seja muito menor do que\u00a0<\/b><\/span><\/span>L<\/b><\/i><\/span><\/span>\u00a0<\/b><\/span><\/span>e que\u00a0<\/b><\/span><\/span>a imagem registre completamente o objeto.<\/b><\/span><\/span>\u00a0Nesse caso,\u00a0<\/b><\/span><\/span>a altura da imagem registrada no filme ser\u00e1:<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

(A)\u00a02 cm<\/b><\/span><\/span><\/p>\n

(B)\u00a04 cm<\/b><\/span><\/span><\/p>\n

(C)\u00a06 cm<\/b><\/span><\/span><\/p>\n

(D)\u00a08 cm<\/b><\/span><\/span><\/p>\n

03-(PUC-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Reflex\u00e3o da luz e espelhos planos<\/span><\/span><\/span><\/p>\n

 <\/p>\n

04-(Faculdade de Medicina do Hospital Israelita Albert Einstein)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

05-(UFJF-MG-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Espelhos esf\u00e9ricos<\/span><\/span><\/span><\/p>\n

 <\/p>\n

06-(UFPR-PR-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>espelho c\u00f4ncavo com raio de curvatura 10 cm\u00a0<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/span>centro em C,\u00a0<\/b><\/span><\/span>foi <\/b><\/span><\/span>posicionado de acordo\u00a0<\/b><\/span><\/span>com a\u00a0<\/b><\/span><\/span>figura a seguir.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>objeto O, com 2 cm de altura,\u00a0<\/b><\/span><\/span>est\u00e1\u00a0<\/b><\/span><\/span>localizado a 3 cm do espelho\u00a0<\/b><\/span><\/span>e<\/b><\/span><\/span>orientado para baixo,\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>partir\u00a0<\/b><\/span><\/span>do\u00a0<\/b><\/span><\/span>eixo principal.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Os\u00a0<\/b><\/span><\/span>segmentos que podem ser observados sobre o eixo principal s\u00e3o equidistantes entre si.<\/b><\/span><\/span><\/span><\/span><\/p>\n

a) Na figura, assinale o foco do espelho, ressaltando-o<\/b><\/span><\/span>\u00a0por meio da\u00a0<\/b><\/span><\/span>letra F.<\/b><\/span><\/span><\/span><\/span><\/p>\n

b) Determine, graficamente na figura,\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>imagem formada,\u00a0<\/b><\/span><\/span>representando <\/b><\/span><\/span>adequadamente<\/b><\/span><\/span>\u00a0no\u00a0<\/b><\/span><\/span>m\u00ednimo dois raios \u201cnot\u00e1veis\u201d, antes e ap\u00f3s<\/b><\/span><\/span>\u00a0a <\/b><\/span><\/span>ocorr\u00eancia da reflex\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>Determine,\u00a0<\/b><\/span><\/span>apresentando os devidos c\u00e1lculos<\/b><\/span><\/span>, o\u00a0<\/b><\/span><\/span>tamanho da imagem.<\/b><\/span><\/span><\/span><\/span><\/p>\n

07-(UNIMONTES \u2013 MG \u2013 017 \u2013 PAES 2<\/b><\/span><\/span><\/span>a<\/b><\/span><\/span><\/sup><\/span>\u00a0etapa)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

08-(FATEC \u2013 SP \u2013 16\/17)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

A malha ferrovi\u00e1ria europeia \u00e9 uma das mais antigas e extensas do mundo, com cerca de 260 mil quil\u00f4metros. Apesar de toda tecnologia moderna de seguran\u00e7a implantada em toda rede, as companhias ferrovi\u00e1rias ainda adotam um sistema b\u00e1sico de reflex\u00e3o luminosa nas plataformas. Um\u00a0<\/b><\/span><\/span>espelho \u00e9 colocado no ponto exato onde o operador (maquinista) para a composi\u00e7\u00e3o<\/b><\/span><\/span>, de modo que ele possa verificar se todos os passageiros embarcaram e desembarcaram. A fim de tornar isso poss\u00edvel, o espelho deve\u00a0<\/b><\/span><\/span>refletir um amplo \u00e2ngulo de vis\u00e3o<\/b><\/span><\/span>, ou seja, maior campo visual.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para que isso aconte\u00e7a, as companhias devem utilizar um espelho<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span>plano<\/b><\/span><\/span>, com a\u00a0<\/b><\/span><\/span>mesma altura do vag\u00e3o<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span>convexo<\/b><\/span><\/span>, com um\u00a0<\/b><\/span><\/span>valor alto de verg\u00eancia em m\u00f3dulo<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span>c\u00f4ncavo<\/b><\/span><\/span>, cuja\u00a0<\/b><\/span><\/span>verg\u00eancia possui um valor baixo em m\u00f3dulo<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span>convergente<\/b><\/span><\/span>, cuja\u00a0<\/b><\/span><\/span>verg\u00eancia possui um valor alto e negativo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span>divergente<\/b><\/span><\/span>, cuja<\/b><\/span><\/span>\u00a0verg\u00eancia possui um valor alto e positivo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

09-(UNICAMP-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

10-(FMABC-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

11-(FAMERP-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma\u00a0<\/b><\/span><\/span>calota esf\u00e9rica \u00e9 refletora\u00a0<\/b><\/span><\/span>em\u00a0<\/b><\/span><\/span>ambas as faces,\u00a0<\/b><\/span><\/span>constituindo, ao<\/b><\/span><\/span>mesmo tempo, um espelho c\u00f4ncavo e um espelho convexo,\u00a0<\/b><\/span><\/span>de\u00a0<\/b><\/span><\/span>mesma dist\u00e2ncia focal, em m\u00f3dulo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

A\u00a0<\/b><\/span><\/span>figura 1\u00a0<\/b><\/span><\/span>representa\u00a0<\/b><\/span><\/span>uma pessoa diante da face c\u00f4ncava e sua respectiva imagem, e a figura 2 representa a mesma pessoa diante da face convexa e sua respectiva imagem.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

a)\u00a0<\/b><\/span><\/span>Considerando as\u00a0<\/b><\/span><\/span>informa\u00e7\u00f5es contidas na figura 1, calcule o m\u00f3dulo da dist\u00e2ncia focal desses espelhos.<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>Na situa\u00e7\u00e3o da\u00a0<\/b><\/span><\/span>figura 2, calcule o aumento linear transversal produzido pela face convexa da calota.<\/b><\/span><\/span><\/span><\/span><\/p>\n

12-(Faculdade de Tecnologia Termomec\u00e2nica \u2013 SP)\u00a0<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Analise a figura.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

(http:\/\/dornsife.usc.edu)<\/b><\/span><\/span><\/p>\n

Com\u00a0<\/b><\/span><\/span>rela\u00e7\u00e3o ao espelho e \u00e0 imagem da m\u00e3o<\/b><\/span><\/span>, \u00e9\u00a0<\/b><\/span><\/span>correto afirmar\u00a0<\/b><\/span><\/span>que eles s\u00e3o, respectivamente,<\/b><\/span><\/span><\/p>\n

(A) c\u00f4ncavo e real.<\/b><\/span><\/span><\/p>\n

(B) c\u00f4ncavo e virtual.<\/b><\/span><\/span><\/p>\n

(C) convexo e real.<\/b><\/span><\/span><\/p>\n

(D) convexo e virtual.<\/b><\/span><\/span><\/p>\n

(E) plano e real.<\/b><\/span><\/span><\/p>\n

13-(UERJ-RJ\/017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em uma\u00a0<\/b><\/span><\/span>aula pr\u00e1tica de \u00f3ptica,\u00a0<\/b><\/span><\/span>um\u00a0<\/b><\/span><\/span>espelho esf\u00e9rico c\u00f4ncavo\u00a0<\/b><\/span><\/span>\u00e9 utilizado para\u00a0<\/b><\/span><\/span>obter a imagem\u00a0<\/b><\/span><\/span>de um<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

pr\u00e9dio.<\/b><\/span><\/span><\/p>\n

Considere as\u00a0<\/b><\/span><\/span>seguintes medidas:<\/b><\/span><\/span><\/p>\n

\u2022\u00a0<\/span>altura do pr\u00e9dio =\u00a0<\/b><\/span><\/span>20 m;<\/b><\/span><\/span><\/p>\n

\u2022\u00a0<\/span>dist\u00e2ncia do pr\u00e9dio ao espelho =\u00a0<\/b><\/span><\/span>100 m;<\/b><\/span><\/span><\/p>\n

\u2022\u00a0<\/span>dist\u00e2ncia focal do espelho =<\/b><\/span><\/span>\u00a020 cm.<\/b><\/span><\/span><\/p>\n

Admitindo<\/b><\/span><\/span>\u00a0que a\u00a0<\/b><\/span><\/span>imagem conjugada\u00a0<\/b><\/span><\/span>se\u00a0<\/b><\/span><\/span>situe\u00a0<\/b><\/span><\/span>no\u00a0<\/b><\/span><\/span>plano focal do espelho, <\/b><\/span><\/span>calcule, em\u00a0<\/b><\/span><\/span>cent\u00edmetros, a altura dessa imagem.<\/b><\/span><\/span><\/p>\n

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

Refra\u00e7\u00e3o luminosa<\/span><\/span><\/span><\/p>\n

 <\/p>\n

14-(Medicina \u2013 EMESCAM \u2013 ES \u2013 017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

 <\/p>\n

15-(IFMG-MG-2017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em um experimento de \u00f3ptica, o professor Rafael faz com que um raio de luz monocrom\u00e1tico<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

incida da maneira representa ao lado. O raio de luz <\/b><\/span><\/span>forma um \u00e2ngulo de 90\u00b0 com a superf\u00edcie da \u00e1gua.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O raio luminoso\u00a0<\/b><\/span><\/span>inicialmente viajava no ar e passa a viajar na \u00e1gua.<\/b><\/span><\/span>Acerca deste experimento, \u00e9\u00a0<\/b><\/span><\/span>CORRETO<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>afirmar que:<\/b><\/span><\/span><\/span><\/span><\/p>\n

A)\u00a0a luz n\u00e3o sofreu refra\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

B)\u00a0o \u00e2ngulo de incid\u00eancia vale 90\u00b0.<\/b><\/span><\/span><\/span><\/span><\/p>\n

C)\u00a0a frequ\u00eancia da luz sofreu altera\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

D) o comprimento de onda da luz sofreu altera\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

16-(PUC-RJ\/017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>feixe luminoso proveniente de um laser<\/b><\/span><\/span>\u00a0se propaga\u00a0<\/b><\/span><\/span>no ar e incide sobre a superf\u00edcie horizonta<\/b><\/span><\/span>l <\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

da<\/b><\/span><\/span> \u00e1gua fazendo um \u00e2ngulo de 45<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>\u00a0com a vertical.<\/b><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>\u00e2ngulo que o feixe refratado forma com a vertical\u00a0<\/b><\/span><\/span>\u00e9:<\/b><\/span><\/span><\/p>\n

Dados: \u00cdndice de refra\u00e7\u00e3o do ar<\/b><\/span><\/span>, 1,0;\u00a0<\/b><\/span><\/span>\u00cdndice de refra\u00e7\u00e3o da \u00e1gua,\u00a0<\/b><\/span><\/span>1,5;<\/b><\/span><\/span>sen30<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>\u00a0= 1\/2;\u00a0<\/b><\/span><\/span>sen45<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>\u00a0=\u00a0\"\"\/2 e\u00a0<\/b><\/span><\/span>sen60<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>\u00a0=\u00a0\"\"\/2.<\/b><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span>\u00a0menor que 30\u00ba.<\/b><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span>maior que 30o\u00a0e menor que 45<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span>igual a 45<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span>maior que 45<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>\u00a0e menor que 60<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span>maior que 60<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/p>\n

17-(FMJ-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

As figuras representam\u00a0<\/b><\/span><\/span>raios de mesma luz monocrom\u00e1tica\u00a0<\/b><\/span><\/span>que\u00a0<\/b><\/span><\/span>sofrem refra\u00e7\u00e3o ao incidirem na superf\u00edcie de separa\u00e7\u00e3o de dois meios diferentes<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Os meios e seus respectivos \u00edndices de refra\u00e7\u00e3o absolutos est\u00e3o indicados na tabela.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Os meios\u00a0<\/b><\/span><\/span>A, B e C s\u00e3o, respectivamente<\/b><\/span><\/span>,<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) diamante, lant\u00e2nio e vidro crown.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B) vidro crown, lant\u00e2nio e diamante.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C) lant\u00e2nio, vidro crown e diamante.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D) vidro crown, diamante e lant\u00e2nio.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E) lant\u00e2nio, diamante e vidro crown.<\/b><\/span><\/span><\/span><\/span><\/p>\n

18-(UNIFESP-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para\u00a0<\/b><\/span><\/span>demonstrar o fen\u00f4meno da refra\u00e7\u00e3o luminosa,<\/b><\/span><\/span>\u00a0um professor faz <\/b><\/span><\/span>incidir um feixe monocrom\u00e1tico<\/b><\/span><\/span>\u00a0de\u00a0<\/b><\/span><\/span>luz no ponto A\u00a0<\/b><\/span><\/span>da superf\u00edcie lateral de um\u00a0<\/b><\/span><\/span>cilindro reto constitu\u00eddo de um material homog\u00eaneo<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>transparente, de \u00edndice de refra\u00e7\u00e3o absoluto igual a 1,6 (figura 1).<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

A figura 2 representa a sec\u00e7\u00e3o transversal circular desse cilindro,<\/b><\/span><\/span>\u00a0que <\/b><\/span><\/span>cont\u00e9m o plano de incid\u00eancia<\/b><\/span><\/span>\u00a0do\u00a0<\/b><\/span><\/span>feixe de luz.<\/b><\/span><\/span><\/p>\n

Ao incidir no ponto A<\/b><\/span><\/span>, o\u00a0<\/b><\/span><\/span>feixe atravessa o cilindro e emerge no ponto B, <\/b><\/span><\/span>sofrendo um\u00a0<\/b><\/span><\/span>desvio angular\u00a0<\/b><\/span><\/span>\u03b1.<\/b><\/span><\/span><\/p>\n

Sabendo que a\u00a0<\/b><\/span><\/span>velocidade da luz no v\u00e1cuo \u00e9 igual a 3.10\u00a0<\/b><\/span><\/span>8<\/b><\/span><\/sup><\/span>\u00a0m\/s,<\/b><\/span><\/span>\u00a0que o <\/b><\/span><\/span>\u00edndice de refra\u00e7\u00e3o absoluto do<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>ar \u00e9 igual a 1,0<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>adotando sen 53<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span>\u00a0= 0,8, <\/b><\/span><\/span>calcule:<\/b><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0a\u00a0<\/b><\/span><\/span>velocidade escalar<\/b><\/span><\/span>\u00a0do feixe luminoso, em\u00a0<\/b><\/span><\/span>m\/s, no interior do cilindro.<\/b><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0o\u00a0<\/b><\/span><\/span>desvio angular\u00a0<\/b><\/span><\/span>\u03b1<\/b><\/span><\/span>,<\/b><\/span><\/span>\u00a0em\u00a0<\/b><\/span><\/span>graus,<\/b><\/span><\/span>\u00a0sofrido pelo\u00a0<\/b><\/span><\/span>feixe luminoso ao atravessar o cilindro.<\/b><\/span><\/span><\/p>\n

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

19-(Medicina \u2013 USCS-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

20-(EsPCEx- AMAN \u2013 SP- RJ \u2013 2016\/17)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

21-(UNITAU MED-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Uma\u00a0<\/b><\/span><\/span>onda luminosa\u00a0<\/b><\/span><\/span>propaga-se num meio A, onde sua\u00a0<\/b><\/span><\/span>velocidade<\/b><\/span><\/span>\u00a0\u00e9 c\/(20\u221a3), e incide numa fronteira de separa\u00e7\u00e3o com um meio B,\u00a0<\/b><\/span><\/span>formando<\/b><\/span><\/span>um \u00e2ngulo de 60 graus com a normal.\u00a0<\/b><\/span><\/span>No meio B<\/b><\/span><\/span>, a velocidade de propaga\u00e7\u00e3o da luz passa a ser c\/60.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Note que c \u00e9 a\u00a0<\/b><\/span><\/span>velocidade da luz\u00a0<\/b><\/span><\/span>no v\u00e1cuo, sendo c = 3 x 10<\/b><\/span><\/span>5<\/b><\/span><\/sup><\/span> km\/s.<\/b><\/span><\/span><\/p>\n

Dados:<\/b><\/span><\/span>\u00a0sen(60\u00b0) = \u221a3\/2 ; cos(60\u00b0) = 1\/2 ; sen(30\u00b0) = 1\/2 ; cos(30\u00b0) = \u221a3\/2<\/b><\/span><\/span><\/p>\n

Admitindo a possibilidade\u00a0<\/b><\/span><\/span>da exist\u00eancia\u00a0<\/b><\/span><\/span>f\u00edsica e qu\u00edmica desses meios, \u00e9 CORRETO afirmar que o\u00a0<\/b><\/span><\/span>\u00e2ngulo de refra\u00e7\u00e3o\u00a0<\/b><\/span><\/span>dessa onda \u00e9 de<\/b><\/span><\/span><\/p>\n

a) 30 graus<\/b><\/span><\/span><\/p>\n

b) 60 graus<\/b><\/span><\/span><\/p>\n

c) 45 graus<\/b><\/span><\/span><\/p>\n

d) 75 graus<\/b><\/span><\/span><\/p>\n

e) 65 graus<\/b><\/span><\/span><\/p>\n

Reflex\u00e3o Total<\/span><\/span><\/span><\/p>\n

22-(UNESP-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Prismas<\/span><\/span><\/span><\/p>\n

 <\/p>\n

23-(FUVEST-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em uma\u00a0<\/b><\/span><\/span>aula de laborat\u00f3rio de f\u00edsica,<\/b><\/span><\/span>\u00a0utilizando-se o\u00a0<\/b><\/span><\/span>arranjo experimental <\/b><\/span><\/span>esquematizado na\u00a0<\/b><\/span><\/span>figura,<\/b><\/span><\/span>\u00a0foi medido\u00a0<\/b><\/span><\/span>o \u00edndice de refra\u00e7\u00e3o de um material sint\u00e9tico<\/b><\/span><\/span>\u00a0chamado\u00a0<\/b><\/span><\/span>poliestireno.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Nessa experi\u00eancia,\u00a0<\/b><\/span><\/span>radia\u00e7\u00e3o eletromagn\u00e9tica,<\/b><\/span><\/span>\u00a0proveniente de\u00a0<\/b><\/span><\/span>um gerador de micro-ondas,<\/b><\/span><\/span>\u00a0propaga-se\u00a0<\/b><\/span><\/span>no ar e incide perpendicularmente em um dos lados de um bloco de poliestireno,<\/b><\/span><\/span>\u00a0cuja\u00a0<\/b><\/span><\/span>se\u00e7\u00e3o reta<\/b><\/span><\/span>\u00a0\u00e9 um\u00a0<\/b><\/span><\/span>tri\u00e2ngulo ret\u00e2ngulo,<\/b><\/span><\/span>\u00a0que tem\u00a0<\/b><\/span><\/span>um dos \u00e2ngulos medindo 25o,<\/b><\/span><\/span>\u00a0conforme a\u00a0<\/b><\/span><\/span>figura.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>detector de micro-ondas<\/b><\/span><\/span>\u00a0indica que a radia\u00e7\u00e3o\u00a0<\/b><\/span><\/span>eletromagn\u00e9tica sai do bloco propagando-se no ar<\/b><\/span><\/span>\u00a0em uma\u00a0<\/b><\/span><\/span>dire\u00e7\u00e3o que forma um \u00e2ngulo de 15<\/b><\/span><\/span>o<\/b><\/span><\/sup><\/span> com a de incid\u00eancia.<\/b><\/span><\/span><\/span><\/span><\/p>\n

A\u00a0<\/b><\/span><\/span>partir desse resultado,<\/b><\/span><\/span>\u00a0conclui-se que o\u00a0<\/b><\/span><\/span>\u00edndice de refra\u00e7\u00e3o do poliestireno em rela\u00e7\u00e3o ao ar<\/b><\/span><\/span>\u00a0para essa\u00a0<\/b><\/span><\/span>micro-onda<\/b><\/span><\/span>\u00a0\u00e9, aproximadamente,<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

24-(FAMERP-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Lentes<\/span><\/span><\/span><\/p>\n

 <\/p>\n

25-(UFES \u2013 ES \u2013 017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Com o\u00a0<\/b><\/span><\/span>sistema \u00f3ptico ao lado,\u00a0<\/b><\/span><\/span>conseguem-se\u00a0<\/b><\/span><\/span>duas posi\u00e7\u00f5es da lente delgada, P e P\u2019,\u00a0<\/b><\/span><\/span>que\u00a0<\/b><\/span><\/span>produzir\u00e3o imagens n\u00edtidas (focalizadas) do objeto sobre o anteparo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>dist\u00e2ncia<\/b><\/span><\/span>\u00a0entre\u00a0<\/b><\/span><\/span>P e P\u2019 \u00e9 D = 6 cm<\/b><\/span><\/span>, e a\u00a0<\/b><\/span><\/span>dist\u00e2ncia entre o objeto e o anteparo \u00e9 mantida fixa no valor<\/b><\/span><\/span><\/span><\/span><\/p>\n

L = 10 cm<\/b><\/span><\/span>. Determine<\/b><\/span><\/span><\/span><\/span><\/p>\n

A)\u00a0<\/b><\/span><\/span>se as\u00a0<\/b><\/span><\/span>imagens, nos dois casos,\u00a0<\/b><\/span><\/span>t\u00eam a\u00a0<\/b><\/span><\/span>mesma amplia\u00e7\u00e3o, ou seja, se t\u00eam o mesmo tamanho\u00a0<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/span>explique seu racioc\u00ednio.<\/b><\/span><\/span><\/span><\/span><\/p>\n

B)\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>dist\u00e2ncia entre o objeto e a lente\u00a0<\/b><\/span><\/span>na\u00a0<\/b><\/span><\/span>situa\u00e7\u00e3o\u00a0<\/b><\/span><\/span>em que est\u00e3o\u00a0<\/b><\/span><\/span>mais pr\u00f3ximos entre si (posi\u00e7\u00e3o P);<\/b><\/span><\/span><\/span><\/span><\/p>\n

C)\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>dist\u00e2ncia focal\u00a0<\/b><\/span><\/span>da\u00a0<\/b><\/span><\/span>lente.<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

26-(FMJ-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Leia o an\u00fancio.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

(www.importecnica.com.br. Adaptado.)<\/b><\/span><\/span><\/span><\/span><\/p>\n

Considere que o \u201caumento de 5 vezes\u201d signifique\u00a0<\/b><\/span><\/span>imagem direita e 5 vezes maior do que o objeto quando este se encontra a 20 cm da lente. A dist\u00e2ncia focal dessa lente \u00e9<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) 100 cm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B) 25 cm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C) 10 cm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D) 17 cm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E) 20 cm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

27-(FGV-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

28-<\/b><\/span><\/span><\/span>(<\/b><\/span><\/span>UEMG-MG-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>estudante dispunha de um espelho c\u00f4ncavo\u00a0<\/b><\/span><\/span>e de uma\u00a0<\/b><\/span><\/span>lente biconvexa de vidro\u00a0<\/b><\/span><\/span>para\u00a0<\/b><\/span><\/span>montar<\/b><\/span><\/span>\u00a0um\u00a0<\/b><\/span><\/span>dispositivo que amplia a imagem de um objeto.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Ele ent\u00e3o\u00a0<\/b><\/span><\/span>montou o dispositivo,\u00a0<\/b><\/span><\/span>conforme\u00a0<\/b><\/span><\/span>mostrado<\/b><\/span><\/span>\u00a0no diagrama.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>foco\u00a0<\/b><\/span><\/span>do\u00a0<\/b><\/span><\/span>espelho \u00e9 F\u00a0<\/b><\/span><\/span>e os das\u00a0<\/b><\/span><\/span>lentes s\u00e3o f e f\u2019.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>objeto O<\/b><\/span><\/span>\u00a0\u00e9\u00a0<\/b><\/span><\/span>representado<\/b><\/span><\/span>\u00a0pela\u00a0<\/b><\/span><\/span>seta.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ap\u00f3s a montagem<\/b><\/span><\/span>, o estudante observou que\u00a0<\/b><\/span><\/span>era poss\u00edvel visualizar duas imagens.<\/b><\/span><\/span><\/span><\/span><\/p>\n

As\u00a0<\/b><\/span><\/span>caracter\u00edsticas dessas imagens\u00a0<\/b><\/span><\/span>s\u00e3o:<\/b><\/span><\/span><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span>Imagem 1: real, invertida e maior. Imagem 2: real, invertida e menor.<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>Imagem 1: real, direta e maior. Imagem 2: real, invertida e menor.<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>Imagem 1: virtual, direta e maior. Imagem 2: real, invertida e menor.<\/b><\/span><\/span><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span>Imagem 1: virtual, direta e menor. Imagem 2: real, invertida e maior.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Instrumentos \u00f3pticos<\/span><\/span><\/span><\/p>\n

29-(UNICAMP-SP-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considere que, de\u00a0<\/b><\/span><\/span>forma simplificada,<\/b><\/span><\/span>\u00a0a\u00a0<\/b><\/span><\/span>resolu\u00e7\u00e3o m\u00e1xima de um microsc\u00f3pio \u00f3ptico<\/b><\/span><\/span>\u00a0\u00e9\u00a0<\/b><\/span><\/span>igual<\/b><\/span><\/span>\u00a0ao\u00a0<\/b><\/span><\/span>comprimento de onda da luz incidente no objeto a ser observado.<\/b><\/span><\/span><\/p>\n

Observando a\u00a0<\/b><\/span><\/span>c\u00e9lula representada na figura abaixo,<\/b><\/span><\/span>\u00a0e sabendo que o <\/b><\/span><\/span>intervalo de frequ\u00eancias<\/b><\/span><\/span>\u00a0do<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

espectro de luz vis\u00edvel est\u00e1 compreendido entre 4,0.10<\/b><\/span><\/span>14<\/b><\/span><\/sup><\/span>\u00a0<\/b><\/span><\/span>Hz e 7,5.10<\/b><\/span><\/span>14<\/b><\/span><\/sup><\/span>\u00a0Hz, <\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>menor estrutura celular<\/b><\/span><\/span>\u00a0que se\u00a0<\/b><\/span><\/span>poderia observar nesse microsc\u00f3pio de luz<\/b><\/span><\/span>\u00a0seria\u00a0<\/b><\/span><\/span>(Se necess\u00e1rio, utilize c = 3.10<\/b><\/span><\/span>8<\/b><\/span><\/sup><\/span>\u00a0m\/s.)<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00d3ptica Fisiol\u00f3gica<\/span><\/span><\/span><\/p>\n

30-(COL\u00c9GIO NAVAL \u2013 2016\/17)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\u00d3ptica\"<\/p>\n

 <\/p>\n

Confira as resolu\u00e7\u00f5es comentadas<\/span><\/a><\/h3>\n

 <\/p>\n

Clique aqui para ver sobre o tema!<\/a><\/p>\n

Confira as v\u00eddeo aulas!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u00d3ptica Vestibulares recentes por assunto \u2013 2017 \u2013 2016 – 2015 Princ\u00edpios da propaga\u00e7\u00e3o retil\u00ednea da luz 01-(UFLA \u2013 MG \u2013 PAS \u2013 017\/019) Na ter\u00e7a-feira, 12 de abril de 2016, o\u00a0f\u00edsico Stephen Hawking\u00a0anunciou que, em\u00a0parceria\u00a0com os empres\u00e1rios\u00a0Mark Zuckerberg, criador do Facebook, e o bilion\u00e1rio russo Yuri Milner, sondas\u00a0ser\u00e3o enviadas para Alpha Centauri, que \u00e9 o\u00a0astro mais brilhante da constela\u00e7\u00e3o<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3429,"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-3431","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3431","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=3431"}],"version-history":[{"count":5,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3431\/revisions"}],"predecessor-version":[{"id":9895,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3431\/revisions\/9895"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3429"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=3431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}