An unpolarised light is incident on a plate of refractive index √3 and the reflected light is found to be completely …..

Q. An unpolarised light is incident on a plate of refractive index √3 and the reflected light is found to be completely plane polarised. The angels of incidence and refraction are respectively

(a) 60°, 30°

(b) 30°, 60°

(c) Sin-1 (1/√3) , 45°

(d) tan -1 (√3/2) , 30°

Ans: (a)

Sol:
According to Brewster Law

μ = tanip

√3 = tanip

ip = 60°

Since , ip + r = 90°

60° + r = 90°

r = 30°

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