At an air–liquid interface the reflected ray is completely plane polarised when the…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

At an air–liquid interface the reflected ray is completely plane polarised when the angle between the reflected and refracted rays is

90^{\circ}

. If the refracted ray inside the liquid makes an angle of

40^{\circ}

with the normal, calculate the refractive index of the liquid. (a)

1.29

(b)

1.41

(c)

1.19

(d)

1.56