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Light travels inside a diamond (n=2.42), and is incident upon the surface with air (n=1.00) on...

Light travels inside a diamond (n=2.42), and is incident upon the surface with air (n=1.00) on the other side.

a)  If the angle of incidence is 15 degrees, what is the angle of reflection?

b)  If the angle of incidence is 15 degrees, what is the angle of refraction?

c)  What is the critical angle at which total internal reflection will occur? If there is no critical angle, explain why.

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