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A beam of unpolarised light passes through a tourmaline crystal A and then it passes through a second tourmaline crystal B oriented so that its principal plane is parallel to that of A. The intensity of emergent light is I₀. Now B is rotated by 45° about the ray. The emergent light will have intensity

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$I_{0} / \sqrt{2}$

$I_{0} \sqrt{2}$

$I_{0} / 2$

$2 I_{0}$

answer is A.

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Detailed Solution

$I = I_{0} \cos^{2} 45^{\circ}$

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