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JEE Main 7 Jan 2020 Shift 1 Solved Paper
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© examsnet.com
Question : 15
Total: 75
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is :
[7-Jan-2020 Shift 1]
18.4°
71.6°
90°
45°
Validate
Solution:
I
0
10
=
I
=
I
0
2
×
cos
2
θ
cos
θ
=
1
√
5
θ
=
63.44
°
angle rotated = 90° – 63.44° = 26.56°
Closest is 1
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