The polarising angle the transparent medium is `'theta'` and 'v' is the speed of light in that medium. Then the relation between `'theta'` and 'v' is
(c = velocity of light in air)

Options

A. `theta=tan^(-1)""(v/c)`
B. `theta =cot^(-1)""(v/c)`
C. `theta=sin^(-1)""(v/c)`
D. `theta=cos^(-1)""(v/c)`

Answer

B

Explanation

From Brewster's law ` tan theta = mu`
But `mu=(c)/(v) " " :. tan theta=(c)/(v)`
` :. cot theta =(v)/(c) " " :. "" theta = cot^(-1)""((v)/(c))`