PURPOSE: To show how a corner reflector works in two dimensions.
DESCRIPTION: A ray of light strikes the two surfaces of the corner reflector and returns antiparallel to the original light ray. For a three-dimensional corner reflector the outgoing light ray also leaves antiparallel to the incoming light ray. The lens keeps the ray narrow.
A set of three rays of different colors can also be used with this two-dimensional corner reflector to show that the rays return inverted with respect to their initial orientation.
REFERENCES: (PIRA unknown.) See Demonstration Reference File for papers on corner reflectors.
EQUIPMENT: Optical board with corner reflector.
SETUP TIME: None.
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