23P1Q15

15 B

Intensity after the horizontally polarising filter $\displaystyle ={{I}_{0}}$

Intensity after the 45° polarising filter $\displaystyle ={{I}_{0}}{{(\cos 45{}^\circ )}^{2}}=0.5{{I}_{0}}$

Intensity after the vertically polarising filter $\displaystyle =(0.5{{I}_{0}}){{(\cos 45{}^\circ )}^{2}}=0.25{{I}_{0}}$

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