Unpolarized light passes through two ideal polaroid sheets. 12.3% of the incident light is transmitted. what is the angle between the transmission axes of the polaroid sheets?

Explanation:

If I be the intensity of original light , after first polarization , its intensity becomes I/2

After second polarization its intensity becomes I/2 X Cos²θ

where θ is the angle between the two polaroids

So I₁ = I/2 Cos²θ

I₁ / I =.5 X Cos²θ = 0.123

Cos²θ = 0.246

θ = 60 degree. Ans

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