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9 June, 07:01

Diamond has an index of refraction of 2.419. What is the critical angle for internal reflection inside a diamond that is in air? A) 155° B) 105° C) 48.8° D) 24.4° E) 131°

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  1. 9 June, 10:13
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    C) 24.4°

    Explanation:

    let nd = 2.419 be the index of refraction of diamond and na = 1.0 be the index of refraction of air and ∅c be the critical angle.

    according to Snell's Law:

    sin (∅c) = na/nd

    sin (∅c) = (1.0) / (2.419)

    ∅c = 24.4°
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