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A ray of light is incident at small angl...

A ray of light is incident at small angle I on the surface of prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is `mu`, the angle of incidence is nearly equal to

A

`A/mu`

B

`A/(2mu)`

C

`muA`

D

`(muA)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
As refracted ray emerges normally from opposite surface, `r_(2) = 0`
As `A = r_(1) + r_(2) :. r_(1) = A`
Now, `mu = (sini_(1))/(sinr_(1)) = (i_(1))/(r_(1)) = (i)/(A)` or `I = muA`
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