In a system of two polarisers, it is found that the intensity of light from the second polarizer is half from that of the first polariser. The angle between their pass axes is

Question

In a system of two polarisers, it is found that the intensity of light from the second polarizer is half from that of the first polariser. The angle between their pass axes is, 60 °, 30 °, 0 °, 45 °

MARKS App · Accepted Answer

According to Malus law, I = I 0 cos 2 ⁡ θ Here, I = I 0 2 Now, I 0 2 = I 0 cos 2 ⁡ θ ⇒ cos 2 ⁡ θ = 1 2 ⇒ cos ⁡ θ = 1 2 ⇒ θ = cos - 1 ⁡ 1 2 = 45 °

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