A polaroid is placed at 45° to an incoming light of intensity Io. Now the intensity of light passing through polaroid after polarisation would be

  1. Io
  2. Io/2
  3. Io/4
  4. Zero

Answer (Detailed Solution Below)

Option 2 : Io/2
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CONCEPT:

  • Malus law: This law states that the intensity of the polarised light transmitted through the analyser varies as the square of the cosine of the angle between the plane of transmission of the analyser and the plane of the polariser.

I = Io cos2θ

Where Io = Intensity of incoming light and I = Intensity light passing through polaroid

F2 P.Y Madhu 20.04.20 D1

EXPLANATION:

Given - θ = 45°

According to Malus law,

I = Io cos2θ

⇒ I = Io cos245°

⇒ I = Io/2 [As cos 45 = 1/√2]
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