Three polaroid sheets P_{1}, P_{2} and P_{3} are kept parallel to each other such that the angle between pass axes of P_{1} and P_{2} is 45^\circ and that between P_{2} and P_{3} is 45^\circ. If unpolarised beam of light of intensity 128 {Wm}^{-2} is incident on P_{1}. What is the intensity of light coming out of P_{3} ?

Correct Answer is : 16 𝑊𝑚−2

KCET 2020 Physics Solved Paper

Question : 11 of 60

Marks: +1, -0

Three polaroid sheets P1,P2 and P3 are kept parallel to each other such that the angle between pass axes of P1 and P2 is 45° and that between P2 and P3 is 45°. If unpolarised beam of light of intensity 128Wm−2 is incident on P1. What is the intensity of light coming out of P3?

64 𝑊𝑚‌−2
128 𝑊𝑚‌−2
0
16 𝑊𝑚‌−2

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