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 needs to be rotated further, to reduce the output intensity to zero, is

Question

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 needs to be rotated further, to reduce the output intensity to zero, is, 71.6 o, 18.4 o, 90 o, 45 o

MARKS App · Accepted Answer

I = I 0 c o s 2 θ I 0 10 = I 0 cos 2 θ C o s θ = 1 10 = 0.31 1 2 which is 0.707 sin - 1 ( 1 / 2 ) = 45 o and 90 o - θ 45 o so only one option is correct i.e. 18.4 o angle rotated should be = 90 o - 71.6 o = 18.4 o

Search any question & find its solution

Looking for more such questions to practice?