Question

Light that passes through a series of three polarizing filters emerges from the third filter horizontally polarized with an intensity of 280 W/m2. 1) If the polarization angle between the filters increases by 25° from one filter to the next, find the intensity of the incident beam of light, assuming it is initially unpolarized. (Express your answer to two significant figures.) W/m2 Submit

Answer 1

I. 0.0 I, Iz 1 2 3 a' when an unpolarized light passes through polarizer indensity reduces by a facter of Intensity of light after passing through polarizer 1 then its T I I 2 2 Iz = 0.41 I. Angle between polarizers 0 = 25° Intensity of light after passing through polarizer 2 I, Los (25°) = I. Los 2125°) Intensity of light after pressing through polarizer 3 Iz los²/25°) 2 Iz = 0:41 Io x cos?(259) = 0.337 To T, = 280 W/m² -> 0.337 Io = Iz Is 280 0-337 0-337 Io = - 80-86 W/m²