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.

Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA.

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Place one of the spherical lenses into a hole in one of the cards.  Using this as a lens look at the writing on the flexible magnet.

Place the watch glass on the Bunsen burner stand with the curved side down.  Place 10 or 15 ml of water into the watch glass.  Using this as a lens look at the writing on the flexible magnet.

Place the shot glass onto the magnetic calendar and then place the glass marble into the shot glass.  In this configuration you should not be able to read the numbers by looking through the marble because of the very short focal length.  Adding water to the shot glass will increase the focal length and make the numbers recognizable.