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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//2mu`

B

`muA`

C

`muA//2`

D

`A//mu`

Text Solution

Verified by Experts

The correct Answer is:
B

From Snell.s law
`(sini)/(sinr)=mu and r = A`
`rArr" "sini=musinA" …(i)"`
Angles are small, `sin A~~A and sin i~~i`, from equation of (i)
`rArr" "i=muA`
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