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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It may be shown that the zone plate will act as a lens. The zone plate in the silver 35 MM slide holder words best for this. Place the beam expander onto the green laser pointer.  Shine the laser beam onto the top of a razor blade, or the image of the arrow,  so that you get an image of the notch or arrow on the screen. Using the zone plate as a lens, focus the image that is on the first screen onto the second screen. The image on the second screen will be inverted from that on the first screen as it would be with an actual lens. The image on the second screen will be rather faint so a completely darkened room works best.