Activity: Operating the Equipment

￿Measuring the Angle of Polarization and the Light Intensity

uPosition the optical probe so it is pointing at the penlight and picking up the maximum light intensity.

uPrepare the Optical Measurement Setup and start the measurement. Rotate the polarizer 90 degrees at a constant speed, every 20 seconds.

1 Penlight

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2

4

 

 

2 Polarizers

 

5

 

 

 

 

3Optical Probe (CH1)

4 Hand

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3

 

5 Polarizing Direction

 

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6Direction of Turn

7 EA-200

7

￿Measuring Brewster’s Angle

uThe light intensity is displayed on the calculator.

uFrom an angle determined using the protractor, shine the penlight beam onto the glass.

uPosition the optical probe so it is pointing at the light beam and picking up the maximum light intensity.

uRotate the polarizer until the polarization direction is that where the light intensity is the greatest.

uMeasure the polarizing direction of the reflected light.

uMeasure the polarizing direction of the refracted light.

uDetermine the angle of the penlight beam that satisfies the condition expression of Brewster’s angle.

1Penlight

2Polarizer for Reflected Light Measurement

3Optical Probe for Reflected Light Measurement

4Polarizer for Refracted Light Measurement

5Optical Probe for Refracted Light Measurement

To obtain an accurate picture of changes in polarizer angle and light intensity, it is a good idea to graph light intensity at various angles.

2-5-2

English

Measurementasurement

￿Calculator Operation

uPrepare for measurement of light intensity using the optical probe, which will let you determine the angle of polarization.

Using E-CON

m“E-CON”w1(SETUP)b(Wizard)w

1(CASIO)d(Light) 0.1w200w1(YES)

Using a Calculator Program

Find the applicable program in the Program Library (P.2-16-2), input it into your calculator, and then run it.

uThis displays a graph that shows changes in light intensity as the polarizer is rotated.

L: Light Intensity

t(s): Time

uPerform the following operation to measure Brewster’s angle.

uFind the applicable program (Light Multi Meter) in the Program Library (P.2-16-2), input it into your calculator, and then run it to measure light intensity.

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u Investigate changes in Brewster’s angle using materials other than glass.

 

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u The 3D effect is possible because of the slight difference between how an object is

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viewed by the left and right eyes. Consider how 3D imaging technology uses the

characteristics of light polarization to achieve its effects.

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