STANDARD Physics Polarization MCQ Question
Unpolarised light of intensity 32 W m⁻¹ passes through three polarizers such that transmission axis of first is crossed with third. If intensity of emerging light is 2 W m⁻², what is the angle of transmission axis between the first two polarizers?
30°
45°
22.5°
60°
Correct Answer
Detailed Explanation
Let θ be the angle between the axis of the first two polarizers then obviously (90° − θ) is the angle between 2nd and 3rd polarizers. The intensity of light after passing through the polarizers is given by Malus's law. Solving the equation for θ gives 22.5°.
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