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

Options

A. `0^(@)`
B. `80^(@)`
C. `50^(@) - " sin"^(-1) `
D. `sin^(-1) [ (sin 50^(@))/(1.5) ] - 50^(@)`

Answer

B

Explanation

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^(@)` .