Home Physics Wave Optics Polarisation of Light Unpolarized light of intensity 32 Wm –2 pass…
Physics Wave Optics Polarisation of Light MCQ (Single Correct)

Unpolarized light of intensity 32 Wm –2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be

A
32 Wm –2
B
3 Wm –2
C
8 Wm –2
D
4 Wm –2

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Text Solution

Verified by Experts
The correct answer is:
B

Angle between P 1 and P 2 = 30° (given)

Angle between P 2 and P 3 = θ θ = 90° – 30° = 60°

The intensity of light transmitted by P 1 is

According to Malus law the intensity of light transmitted by P 2 is

Similarly intensity of light transmitted by P 3 is

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