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A ray of light is travelling from glass ...

A ray of light is travelling from glass to air. `("Refractive index of glass =1.5")`. The angle of incidence is `50^(@)`. The deviation of the ray is

A

`0^(@)`

B

`80^(@)`

C

`50^(@) - " sin"^(-1) `

D

`sin^(-1) [ (sin 50^(@))/(1.5) ] - 50^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
Critical angle
`i_(C ) = sin^(-1) ((1)/(1.5)) = 42^(@)`
Since, i`gt i_(C )`, so TIR will occur
`therefore " " delta = 180^(@) - (50+ 50) = 80^(@)` .
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