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M5-21: LASER DIFFRACTION - FRESNEL'S MIRROR

PURPOSE: Interference of a laser beam using Fresnel's mirror.

DESCRIPTION: Fresnel's mirror consists of two adjacent nearly parallel dielectric plates. The laser beam reflects at a small angle off the two plates to create interference on a distant screen. The angle of one of the plates can be independently varied about a vertical hinge in the center of the mirror. A 2cm focal length convex lens is used to focus the interference pattern on a nearby screen.

SUGGESTIONS:

REFERENCES: (PIRA unknown.)

EQUIPMENT: Laser cart with Fresnel's mirror, 2cm focal length convex lens.

SETUP TIME: None.


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