KVPY SB SX Exam 2011 Question Paper

Question : 29 of 120

Marks: +1, -0

A plane polarized light passed through successive polarizers which are rotated by 30 with respect to each other in the clockwise direction. Neglecting absorption by the polarizers and given that the first polarizer’s axis is parallel to the plane of polarization of the incident light, the intensity of light at the exit of the fifth polarizer is closest to

same as that of the incident light
17.5% of the incident light
30% of the incident light
zero

Validate

Solution:

I = I_0 (\cos^2\ϕ)^4

=I_0×(3/4)^4=30%\;\;of\;I_0

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