A ray of light is incident on a galss slab making on angle of ` 30^(@)` with the surface . If the angle of refraction in glass is ` 33^(@)`, the angle of deviation of the ray during its passage through the galss slab is

Options

A. `30^(@)`
B. `27^(@)`
C. `40^(@)`
D. `20^(@)`

Answer

B

Explanation

`r=33^(@), i=60^(@) " " :. delta=60^(@)-33^(@)=27^(@)`