Question

The angle of incident at which reflected light is totally polarised for reflection from air to glass (refractive index μ) is 

(a) sin^-1 (μ)

(b) sin^-1 (\(\frac{1}{μ}\))

(c) tan^-1 (\(\frac{1}{μ}\))

(d) tan^-1 (μ)

Answer 1

(d) tan^-1 (μ) 

According to Brewster’s law,

μ = tan i_p ∴ i_p = tan^-1 (μ)