4. 2-magnet tube:

Purpose: To hold polarizer, and adjust the brightness of the light.

Material:

-          SiP

-          Magnet washer

-          Coupler

Procedure:

-          Glue two magnets individually on 2 simple plates.

-          Glue the two plates on two ends of a coupler (the magnets face inward).

Expectation: the magnets have to be at the center.

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