Exploring Light Intensity Through Polarizers

Explore light intensity through linear polarizers at angles from 0° to 90°. Measure transmitted light with lOLab sensor, test repeatability with two trials per angle, and analyze results using Malus' Law.

Daniel Miller

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Physics 102 Lab 7Introduction:The goal of this lab is to explore the intensity of light that is transmitted through a pair of linearpolarizers as a function of the angle between the transmission axes. W e will measure this throughthe lOLab device by utilizing the light feature and measuring ten evenly spaced angles between03to 903for the transmission axes. By making two measurements for each angle, we will be ableto test the repeatability for both our angle and intensity measurements. An important conceptintroduced in this lab is Mains' Law, as it helps us to study the light intensity of apolarizer-analyzer relationship, which will be helpful in assessing the results of this experiment.Methods:1.Place tape on lOLab to create an elevated surface above the light sensor2.Place the polarized filters directly on top of each other (no angle between)3.Measure distance of bottom of flashlight to polarized filters (10cm)4.Record data for 10 seconds using light sensor on lOLab5.Repeat steps 2-4 for two trials6.Move polarized filters so that they are at a 10° degree using a protractor7.Measure distance of bottom of flashlight to polarized filters (10cm)8.Record data for 10 seconds using light sensor on lOLab9.Repeat steps 6-8 for two trials10. Repeat steps 6-8 moving the polarized filter 10° more each time until you reach 90° andrecording data for two trials for each angle

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Equations Used:Mallis' Law: 7 = 7Qcos 6Where 1= intensity oflightafter leaving the second polaroid, 7.= intensity of light beforeentering the second polaroid. and 6 = the angle between two polaroids.Note: when measuring the angle 6it willbe wheretheintensityofthelightis 4- of the highestintensity measured.Results:Data table:background =0.018AngleIntensityliner 5tty witti background subtractedcosA2(thetai00 6440.628100 6680 4 51100 5220 5040 96984631100 KM0.4660.969846312004130.3950.883022222200 4210.4030.883022222300 3690 3510.75300 4060.3680.7540D 2920.2740.586824089400 2820 2640.5868240895002160.1980 413175911500 23202140 4 1 3 1 7 5 9 1 10 00 1320.1140 2 5500 1340 1160 25700 0620.0440.116977778700 06?0.0440 116977778000 03200140.03015369500 029OOH0 03015369900.020 0 0 23.7S247E 33900.01803 75247E 330= tmgle=?ncer?ai7£

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Exploring Light Intensity Through Polarizers

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