Question

Consider a sequence of ideal polarizing lters, each with its axis making the same angle with the axis of
the previous lter. These polarizers rotate the plane of polarization of a light beam by a total angle of 45.

a) In order to have no more than a 10.0% reduction of intensity, what is the minimum number of polarizers needed? Hint: The equation you will set up to solve this will be transcendental, so it is impossible to solve with pen and paper. You should graph both sides of the function separately and see where they intersect. b) What is the angle between adjacent polarizers?

add a graph for part a

Answer 1

From Malus law:- I - Iocoslo Here I - ID - 0.1 Io = 0-9 Io So, an 0.9 1. - Io cos ၄ ) n, is no. of polarizing plates trail method - Using trail n=6, is the correct answer. Angle blw adjacent plates 45 O= = 4.5° 10