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Diamond has a refractive index of about 2.42. Roughly what is its critical angle in air?
AAbout 12 degrees
BAbout 24.5 degrees
CAbout 42 degrees
DAbout 60 degrees
Answer & Solution
Correct answer: B. About 24.5 degrees
sin(theta_c) = 1/2.42 = 0.413, which gives a critical angle of about 24.4 degrees, so the small angle makes diamond sparkle.
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