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Q.

A light ray incident normally on one face of an equilateral prism and emerges out grazingly at the other face. The refractive index of the prism is:

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a

3

b

2

c

23/5

d

2/3

answer is D.

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Detailed Solution

i=0,A=60∘,e=90∘ -if i=0 then r1=0A=r1+r2⇒A=r2=60∘μ×sin⁡r2=1×sin⁡eμ=sin⁡esin⁡r2=sin⁡90∘sin⁡60∘=23
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