A ray is incident normally on a right angle prism whose refractive index is 
and prism angle α = 30 0 , after crossing prism ray passes through glass sphere, it strikes the glass sphere at 
distance from principal axis as shown in figure, sphere is half polished. Find the net angle of deviation of incident ray -
Text Solution
Verified by ExpertsThe correct answer is:
B
μ sin 30 0 = sin β
β = 60 0 δ = 60
0 – 30 0 = 30 0 point P where it strike is 
tan θ = 
= 
∴ θ = 30
0 ∴ θ = δ
so ray strike spherical surface normally
∴ It retrace the path
∴ Angle of deviation = 180
0
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