Question: A narrow beam of light is incident from air onto the surface of glass with index of refraction 1.56. Find the angle of incidence for

A narrow beam of light is incident from air onto the surface of glass with index of refraction 1.56. Find the angle of incidence for which the corresponding angle of refraction is half the angle of incidence.
(Suggestion: You might want to use the trigonometric identity sin 2 θ = 2 sin θ cos θ.)

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