PURPOSE: To demonstrate polarization of light.

DESCRIPTION: The first polaroid polarizes the light. Rotating the front polaroid causes the light to become alternately brighter (polaroids aligned) and dimmer (polaroids crossed), as seen in the two photographs.

SUGGESTIONS:

REFERENCES: (PIRA 6H10.10)

EQUIPMENT: Goose neck lamp, large round polaroids on base, extra square polaroid.

SETUP TIME: None.