What is the (average) energy density of this light before if strikes the polariz

Question

What is the (average) energy density of this light before if strikes the polarizer? (a) 5 times 10^-8 J/m^3 (b) 15 J/m^3 (c) 4.5 times 10^-9 J/m^3 Having passed through that vertically oriented polarizer, the light strikes a second polarizer, whose transmission axis is 40 degree away from vertical. What is the intensity of light from that second polarizer? (a) 3.1 W/m^2 (b) 4.4 W/m^2 (c) 5.7 W/m^2 (d) 8.8 W/m^2 (e) 11.5 W/m^2 It is possible to increase the intensity of light emerging from that second polarizer by inserting a third polarizer, suitable oriented, between the first two. (a) True (b) False

Explanation / Answer

here,

when the unpolarized light passes through the first polarizer , s1 = s0 /2

let the angle between the polarizers be theta

for the seccond polarizer

s2 = s1 * cos(theta)^2

0.33 * s0 = 0.5 * s0 * cos(theta)^2

theta = 35.7 degree

the angle between the polarizers is e) 35.7 degree

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