# A beam of unpolarised light is passed first through tourmaline crystan A and then through another tourmaline crystal B oriented so that its principal

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A beam of unpolarised light is passed first through tourmaline crystan A and then through another tourmaline crystal B oriented so that its principal plane is parallel to that of A. The intensity of the emergent light is I. If A now rotated by 45^(@) in a plane perpendicular to the direction of the incident ray, the intensity of the emergent light will be
A. I/2
B. I/sqrt(2)
C. I
D. I/4

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