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A ray is ihncident at an angle of incide...

A ray is ihncident at an angle of incidence ii on one surface of a prism of small angle A and emerge normally from opposite surface. If the refractive index of the material of prism is `mu.` the angel of incidance I 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 oppostite surface, `r_(2)=0`
As `A=r_(1)+r_(2)" "therefore r_(1)=A`
Now, `mu=(sini_(1))/(sinr_(1))=(i_(1))/(i_(1))=(i)/(A),i=muA`
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