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Polarizer Demonstrator Introduction

Polarizer Demonstrator (OS-9477A)

*See the PASCO catalog or web site at

WWW.PASCO.COM

Introduction

The Polarizer Demonstrator can be used for easily visible

classroom demonstrations. They can show how the intensity

of transmitted light through two polarizers varies with the

angle of one polarizer compared to the other. The Polarizer

Demonstrator can be used to investigate stress distribution

patterns by viewing clear plastic objects between crossed

polarizers.

The Polarizer Demonstrator has two Polarizer Disks and two

Polarizer Bases. The plastic frame of the Polarizer Disk has

degree indicators every five degrees. The plastic frame fits

into the curved portion of the Polarizer Base and can be

rotated easily in the base. The Polarizer Base has an Angle

Alignment Mark on both sides. The base has notches on its

bottom edge that fit on top of a PASCO Optics Track. Each

base also has an alignment tab and an alignment notch on

both sides. The base has two threaded holes (1/4” - 20

threads per inch) for mounting accessories, and a hole that

can be used to attach the base to an optics track if necessary

(mounting hardware not included).

WARNING: Handle the Polarizer Disks carefully. Avoid

touching the polarizer material of the Polarizer Disk.

Cleaning

To remove finger prints from the polarizer material, use only

lens cleaning tissue or a soft cloth that is specifically

designed for cleaning eyeglasses. Do not put liquids on the

polarizer material.

Setup

1. Place each Polarizer Disk in a Polarizer Base. Place the

bases so that the alignment tabs fit into the alignment

notches.

2. For use with a PASCO Optics Track: Place each

Polarizer Disk into a Polarizer Base. Place both bases on

the PASCO Optics Track so that the notches in the bot-

tom of the bases fit on top of the optics track. Adjust the

distance between the polarizers as needed.

Operation

Set each Polarizer Disk so that the zero degree mark is next

to the angle alignment mark on the Polarizer Base. Look

through both disks at an object or light source. Slowly turn

one of the Polarizer Disks and observe what happens to the

intensity of light transmitted through the disks. Note the

angle of the disk that you turned. Continue turning the Polar-

izer Disk until the 180 degrees mark is next to the angle

alignment mark on the base. Compare the intensity of light

transmitted through the disks to the intensity of light trans-

mitted at zero degrees.

Suggestions

Set one Polarizer Disk at zero degrees and the second at 90

degrees. (This is called “cross-polarized”.) Adjust the second

Included Items Quantity

Polarizer Disk 2

Polarizer Base 2