临界角

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((lín )(jiè )(jiǎo )(lín )(jiè )(jiǎo ))

(guāng )线(xiàn )(yóu )(guāng )()(xiǎo )(de )(méi )(zhì )(jìn )()(guāng )()()(de )(méi )(zhì )(de )(shé )(shè )(jiǎo )(wéi )90°(shí )(de )()(shè )(jiǎo )(jiào )(zuò )(lín )(jiè )(jiǎo )()()(xiǎo )(suí )()(zhì )(de )()(tóng )(ér )(gǎi )(biàn )()(shuǐ )(shì )48.5°,(jīn )(gāng )(shí )(shì )23.7°。

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