A prism having an apex angle of 4 0 and refractive index of 1.50 is located in front of a vertical plane mirror as shown. A horizontal ray of light is incident on the prism. The total angle through which the ray is deviated is:
Text Solution
Verified by ExpertsThe correct answer is:
B
Deviation by prism.
δ 1 = A ( μ – 1) = 4º (1.5 – 1) ⇒ δ 1 = 2º
for plane mirror
i = 2º δ 2 = 180 – 21 = 176º ⇒ δ = δ 1 + δ 2 = 178º
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