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°
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Ans: (a)
Sol: According to Brewster Law
μ = tanip
√3 = tanip
ip = 60°
Since , ip + r = 90°
60° + r = 90°
r = 30°