A ray of light is incident on ice slab making an angle of `50^(@)` with the normal. The angle of refraction and velocity of light in ice of the refractive index 1.3 are

Options

A. `35^(@)6', 2.307 xx 10^(8) m//s`
B. `36^(@)6', 2.307 xx 10^(8) m//s`
C. `36^(@)6', 3.307 xx 10^(8) m//s`
D. `35^(@)6', 3.307 xx 10^(8) m//s`

Answer

B

Explanation

`sin r = (sin i)/(mu) = (sin 50)/(1.3)`
`r = 36^(@)6'`
`v_(i) = (v_(a))/(mu_(i)) = (3 xx 10^(8))/(1.3) = 2.307 xx 10^(8) m//s`