Register to reply

Three polarizers

by Sir_Pogo
Tags: polarizers
Share this thread:
Dec10-06, 01:36 AM
P: 12
Polarizers 1 and 3 have their axes of polarization, indicated by the black solid lines, perpendicular to each other. If you try to shine light through only the combination of 1 and 3, you will find that none passes through. However, now we put in another polarizer (number 2 in the figure) between number 1 and number 3. This polarizer has an axes of polarization that has an angle of θ = 71 with respect to the polarization axes of polarizer 1. Surprisingly, now some light passes through the combination 1+2+3. What percentage of the initial (unpolarized) light intensity passes through?

The light passing through the
first polarizer should be 0.5I(nought). The light passing
through the second polarizer should be
0.5I(nought)*cos^2(angle given). The light passing through
the third polarizer should be the previous answer times
cos^2(angle between axes 2 and 3...)

My answer is not coming out right...Any suggestions of what
I may be doing wrong?
Phys.Org News Partner Science news on
Wildfires and other burns play bigger role in climate change, professor finds
SR Labs research to expose BadUSB next week in Vegas
New study advances 'DNA revolution,' tells butterflies' evolutionary history
Dec10-06, 12:42 PM
berkeman's Avatar
P: 40,730
Are you using 71 degrees for the first angle and 90-71 degrees for the second angle?

Register to reply

Related Discussions
Polarizers spectrum selectivity Quantum Physics 2
Intensity of Light by Polarizers Introductory Physics Homework 5
Re: Polarization with three 45 degree polarizers Advanced Physics Homework 1
Find the final percentage of light exiting the last polizer General Physics 2