Four polarizers are set up so that the transmission axis of each successive polarizer is rotated clockwise by an angle θ relative to the previous polarizer. Find the angle θ for which unpolarized light is transmitted through these four polarizers with its intensity reduced by a factor of 20.
Copyright © 2024 1QUIZZ.COM - All rights reserved.
Answers & Comments
Verified answer
The normalised transmission factor is cosθ e.g. for θ=90deg transmission = 0
Transmissions are multiplicative for polarizers in series.
So each polariser needs a transmission factor of 1 / 20^-4 = 0.4729
to reduce the tansmission by a factor of 20.
Hence θ = arccos(0.4729) = 61.8 deg