For a prism kept in air, it is found that for an angle of incidence 60°, the angle of refraction A, angle of deviation and angle of emergence e become equal. Then, the refractive index of the prism is
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a
1.73
b
1.15
c
1.5
d
1.33
answer is A.
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Detailed Solution
Given i=60∘ and A=δ=eδ=i+e−A⇒δ=i(∵e=A) μ=sinA+δm2sinA2 Here, angle of deviation is minimum (∵ i =e)μ=sin60∘+60∘2sin(602)=1.73
For a prism kept in air, it is found that for an angle of incidence 60°, the angle of refraction A, angle of deviation and angle of emergence e become equal. Then, the refractive index of the prism is