Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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Put the Screw in Globe Light source on the large plate at one end of the optics bench. Put the cardboard screen at the other end with the ball on the wire in the center of the bench so that you can move it to and away from the light source. Observe the shadow on the screen. In the larger lecture rooms you will have to show the shadows with the camera.

The earth, moon, sun demo can also be used to show an eclipse.  Note that the best times to get an eclipse with this model is when the Earth is straight up and down.  This usually is only done in small class rooms as the shadow is very small.