{"id":4317,"date":"2019-01-24T02:01:35","date_gmt":"2019-01-24T02:01:35","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4317"},"modified":"2024-08-22T14:42:00","modified_gmt":"2024-08-22T14:42:00","slug":"optica-geometrica-reflexao-total","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/formulario\/optica-geometrica-reflexao-total\/","title":{"rendered":"\u00d3ptica geom\u00e9trica – Reflex\u00e3o Total"},"content":{"rendered":"

Formul\u00e1rio completo de F\u00edsica com informa\u00e7\u00f5es \u00fateis <\/b><\/span><\/span><\/span><\/p>\n

(Dicas para vestibulares)<\/b><\/span><\/span><\/span><\/p>\n

\u00d3ptica geom\u00e9trica<\/b><\/span><\/span><\/span><\/p>\n

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

Reflex\u00e3o total \u2013 \u00c2ngulo Limite (L)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Informa\u00e7\u00f5es \u00fateis <\/b><\/span><\/span><\/span>(dicas para vestibulares)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span>\u00e2ngulo limite\u00a0<\/b><\/span><\/span>pode ser\u00a0<\/b><\/span><\/span>\u00e2ngulo de incid\u00eancia (fig. 1) ou \u00e2ngulo de refra\u00e7\u00e3o (fig. 2)<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Reflex\u00e3o normal ou externa\u00a0<\/b><\/span><\/span>\u00e9 sempre\u00a0<\/b><\/span><\/span>acompanhada de dispers\u00e3o, absor\u00e7\u00e3o e <\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

refra\u00e7\u00e3o,\u00a0<\/b><\/span><\/span>mas na\u00a0<\/b><\/span><\/span>reflex\u00e3o total ou interna (como nos prismas \u00f3pticos) nenhuma luz se refrata, por isso a reflex\u00e3o total\u00a0<\/b><\/span><\/span>\u00e9\u00a0<\/b><\/span><\/span>muito usada na pr\u00e1tica,\u00a0<\/b><\/span><\/span>para\u00a0<\/b><\/span><\/span>substituir os espelhos <\/b><\/span><\/span>por\u00a0<\/b><\/span><\/span>meios transparentes\u00a0<\/b><\/span><\/span>(vidros ou cristais de\u00a0<\/b><\/span><\/span>reflex\u00e3o total<\/b><\/span><\/span>) e nos <\/b><\/span><\/span>instrumentos \u00f3ticos.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Fibras \u00f3pticas<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Utilizados em\u00a0<\/b><\/span><\/span>comunica\u00e7\u00f5es<\/b><\/span><\/span>\u00a0(rede telef\u00f4nica, televis\u00e3o por cabo, distribui\u00e7\u00e3o de energia el\u00e9trica), em<\/b><\/span><\/span> <\/b>medicina<\/b><\/span><\/span>\u00a0(sistemas de monitora\u00e7\u00e3o interna do corpo humano e instrumenta\u00e7\u00e3o cir\u00fargica), etc.<\/b><\/span><\/span><\/span><\/span><\/p>\n

N\u00e3o importa a\u00a0<\/b><\/span><\/span>dist\u00e2ncia, levam a informa\u00e7\u00e3o quase instantaneamente, ou seja, \u00e0 velocidade pr\u00f3xima \u00e0 da luz.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Brilho dos diamantes<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

Cor do Sol ao entardecer<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/a> Em virtude da\u00a0<\/b><\/span><\/span>refra\u00e7\u00e3o na atmosfera terrestre,<\/b><\/span><\/span>\u00a0um\u00a0<\/b><\/span><\/span>observador na Terra <\/b><\/span><\/span>pode ver o Sol mesmo quando esse\u00a0<\/b><\/span><\/span>est\u00e1 totalmente abaixo da linha do horizonte, como voc\u00ea pode observar na figura onde, <\/b><\/span><\/span>\u00e0 medida que os\u00a0<\/b><\/span><\/span>raios de luz provenientes do Sol penetram na <\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

atmosfera da Terra,\u00a0<\/b><\/span><\/span>v\u00e3o encontrando\u00a0<\/b><\/span><\/span>camadas de ar cada vez mais densas, mais refringentes e de maiores \u00edndices de refra\u00e7\u00e3o<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>aproximam-se cada vez mais da normal <\/b><\/span><\/span>sofrendo os desvios mostrados.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Esses\u00a0<\/b><\/span><\/span><\/span>desvios fazem com que a imagem que se observa do Sol ao amanhecer\u00a0<\/b><\/span><\/span><\/span>(antes de o Sol objeto aparecer) a e ao\u00a0<\/b><\/span><\/span><\/span>anoitecer\u00a0<\/b><\/span><\/span><\/span>(depois que o Sol objeto desapareceu)\u00a0<\/b><\/span><\/span><\/span>se encontre acima de sua real posi\u00e7\u00e3o, tomando-se como refer\u00eancia o horizonte.<\/b><\/span><\/span><\/span><\/p>\n

Ent\u00e3o,\u00a0<\/b><\/span><\/span><\/span>como a\u00a0<\/b><\/span><\/span><\/span>atmosfera \u00e9 transparente<\/b><\/span><\/span><\/span>, mas\u00a0<\/b><\/span><\/span><\/span>n\u00e3o homog\u00eanea,<\/b><\/span><\/span><\/span>\u00a0os\u00a0<\/b><\/span><\/span><\/span>raios solares sofrem desvio\u00a0<\/b><\/span><\/span><\/span>ao atravess\u00e1-la, fazendo com que o\u00a0<\/b><\/span><\/span><\/span>p\u00f4r do sol seja uma miragem.<\/b><\/span><\/span><\/span><\/p>\n

Como, na\u00a0<\/b><\/span><\/span><\/span>refra\u00e7\u00e3o, as radia\u00e7\u00f5es de menor frequ\u00eancia\u00a0<\/b><\/span><\/span><\/span>(vermelha, amarela e alaranjada)\u00a0<\/b><\/span><\/span><\/span>sofrem menor<\/b><\/span><\/span><\/span> <\/b>desvio,<\/b><\/span><\/span><\/span>\u00a0o\u00a0<\/b><\/span><\/span><\/span>observador v\u00ea a imagem do Sol com predomin\u00e2ncia dessas cores<\/b><\/span><\/span><\/span>, da\u00ed, aquele\u00a0<\/b><\/span><\/span><\/span>tom roseado.<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Formul\u00e1rio completo de F\u00edsica com informa\u00e7\u00f5es \u00fateis (Dicas para vestibulares) \u00d3ptica geom\u00e9trica Reflex\u00e3o Total Reflex\u00e3o total \u2013 \u00c2ngulo Limite (L) Informa\u00e7\u00f5es \u00fateis (dicas para vestibulares) O\u00a0\u00e2ngulo limite\u00a0pode ser\u00a0\u00e2ngulo de incid\u00eancia (fig. 1) ou \u00e2ngulo de refra\u00e7\u00e3o (fig. 2) Reflex\u00e3o normal ou externa\u00a0\u00e9 sempre\u00a0acompanhada de dispers\u00e3o, absor\u00e7\u00e3o e refra\u00e7\u00e3o,\u00a0mas na\u00a0reflex\u00e3o total ou interna (como nos prismas \u00f3pticos) nenhuma luz se refrata,<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3987,"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-4317","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4317","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=4317"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4317\/revisions"}],"predecessor-version":[{"id":4318,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4317\/revisions\/4318"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3987"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=4317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}