1) A beam of unpolarized light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so its principal plane makes an angle 45° relative to that of A. The intensity of the emergent light is A) $I_{0}$ B) $\frac{I_{0}}{2}$ C) $\frac{I_{0}}{4}$ D) $\frac{I_{0}}{8}$ Answer: Option CExplanation: Relation between intensities is $I_{R}=\left(\frac{I_{0}}{2}\right)\cos^{2}(45^{0}) =\frac{I_{0}}{2}\times\frac{1}{2}=\frac{I_{0}}{4}$
