NEET Solved Paper 2017 Question 23
Question: Two Polaroids $ P _1 $ and $ P _2 $ are placed with their axis perpendicular to each other. Un polarised light $ l _0 $ is incident on $ P _1. $ A third polaroid $ P _3 $ is kept in between $ P _1 $ and $ P _2 $ such that its axis makes an angle $ 45^{o} $ with that of $ P _1. $ The intensity of transmitted light through $ P _2 $ is
Options:
A) $ \frac{l _0}{16} $
B) $ \frac{l _0}{2} $
C) $ \frac{l _0}{4} $
D) $ \frac{l _0}{8} $
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Answer:
Correct Answer: D
Solution:
- $ l _2=\frac{l _0}{2}{{\cos }^{2}}45^{o} $ $ =\frac{l _0}{2}\times \frac{1}{2} $ $ =\frac{l _0}{4} $ $ l _3=\frac{l _0}{4}{{\cos }^{2}}45^{o} $ $ l _3=\frac{l _0}{8} $
