# A beam of unpolarised light of intensity I_0 is passed through a polaroidA and then through another polaroid B which is oriented so that its princip

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A beam of unpolarised light of intensity I_0 is passed through a polaroidA and then through another polaroid B which is oriented so that its principal plane makes an angle of 45^circ relative to that of A. The intensity of the emergent light is
A. I_(0)
B. I_(0)//2
C. I_(0)//4
D. I_(0)//8

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Since the incident regent is unporazes after light passes through polaroid A=(I_(0))/(2)
After this light passes through B,
I_("emergent")=I_("in")cos^(2)phi=((I_(0))/(2))cos^(2)45^(@)=(I_(0))/(4)