A beam of unpolarised light passes through a tourmaline crystal A and then it pa

Question

A beam of unpolarised light passes through a tourmaline crystal A and then it passes through a tourmaline crystal B oriented so that its principal plane is parallel to that of A. the intensity of emergent light is

I_{0}

. Now B is rotated by

45^{\circ}

about the ray. The emergent light will have intensity:

Options:

A . I02

B . I0√2

C . √2I0

D . 2I0

Answer: Option A
:
A

I = I_{0} c o s^{2} 45^{\circ} = \frac{I_{0}}{2}

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