Question

Two polaroids are placed with their transmission axis at 90° to each other and transmitted intensity of light is zero. What happens in the intensity if one more polaroid is placed in between them, bisecting the angle between them? ​​

Answer 1

Answer:

If ordinary unpolarised light of intensity Iº' is incident on first Polaroid (A,say),

intensity of light transmitted from first polaroid is Io=Io'/2Given angle between transmission axes of two polaroids A and B is initially 90º.

According to Malus law, intensity of light transmitted from second polaroid (B, say) isI =Io cos2  = I = Io cos290º = 0When one more polaroid (C say) is placed between A and B making an angle of 45º with the transmission axis of either of polaroids, then intensity of light transmitted from A is Ia Io/2=Io/2

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