A transparent medium shows relation between i and r as shown. If the speed of light in vacuum is c, the Brewster's angle for the medium is

Options

A. `60^(@)`
B. `30^(@)`
C. `90^(@)`
D. `45^(@)`

Answer

A

Explanation

(a): `1/(mu)=(sinr)/(sini) = tan 30^(@), mu = cot 30^(@)`
`tan i_(beta) = mu = cot 30^(@) = tan 60^(@)`
`i_(beta) = 60^(@)` [`i_(beta)` is Brewster's angle]