School of Physics Lecture Demonstration Manual

Oa-6 Corner Reflector

Published: Wednesday 15 March 2006 - Updated: Monday 28 March 2011


To demonstrate a retroreflector.


3 Mirror corner


Click on pictures to enlarge.

Corner Reflector Diagram

Corner Mirror Front View

Corner Mirror Left

Corner Mirror Right

Corner Mirror Stationary

Corner Mirror Movement


Corner Mirror


The three mirrors arranged to have three mutually perpendicular faces have the property of being retrodirective; i.e. it will reflect all incoming rays back along their original directions. when viewed from any angle the image of the observer always appears at the vertex of the three mirrors. Alternatively a laser beam directed to the reflector comes straight back. A cloud of chalk dust makes the beams visible to the class.

Safety notes

Sharps safety 

Laser safety


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