First slide

Prism

Question

A ray of light passes through the equilateral prism such that angle of incidence is equal to the angle of emergence if the angle of incidence is 45°. The angle of deviation will be

Moderate

A

15°
B

75°
C

60°
D

30°

Solution

$A = 60^{\circ}, i = e = 45^{\circ} By i + e = A + δ \Rightarrow 45 + 45 = 60 + δ \Rightarrow δ = 30^{\circ}$

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