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A light is travelling from air a medium...

A light is travelling from air a medium the velocity of light in a medium is reduced to to 0.75 times the velocity n air assume that angle of incidence I is very small the deviation of the ray is

A

i

B

`(i)/(3)`

C

`(i)/(4)`

D

`(3i)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
b
When a light travels from air into a medium then velocity of light in a medium is
`V_(m)=V-0.75 V= 0.25 V`
where v is velocity of light in air using snell law we have
`(sini)/(sin r)= mu =(v)/(v_(m))` or `(i)/(r )=(v)/(v_(m))`
or `(i)/(r )=(v)/(0.25 V)=4 rarr r=(i)/(4)`
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