Q.
The light ray is incidence at angle of 60° on a prism of angle 45°. When the light ray falls on the other surface at 90°, the refractive index of the material of prism μ and the angle of deviation δ are given by
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a
μ=2,δ=30∘
b
μ=1.5,δ=15∘
c
μ=32,δ=30∘
d
μ=32,δ=15∘
answer is D.
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Detailed Solution
From figure it is clear that ∠e=∠r2=0 From A=r1+r2⇒r1=A=45∘∴μ=sinisinr1=sin60sin45=32Alsofrom i+e=A+δ⇒60+0=45+δ⇒δ=15∘
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