A ray of light incident at an angle θ in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]

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A. 41.8°
B. 48.2°
C. 60.8°
D. 90.0°

Correct Answer: Option A

A. 41.8°

Explanation

η=1/sinθ
1.5=1/sinθ
sinθ=1/1.5 = 0.667
θ=sin‾¹(0.667) = 41.835°

≊41.8°

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