PURPOSE: To demonstrate birefringent effects

DESCRIPTION: Plastic (cut from plastic sandwich bags) is stretched between crossed polarizers. The effects are noted.

SETUP TIME: Minimal

COMPONENT LIST:

Plastic strips          We should have a few lying around, or bring your own

Polarizers              Located on "Wave" shelf

Light Source            Usually overhead projectors

SUGGESTIONS:

REFERENCES: PIRA 6H35.30

OTHER NOTES: