image credit: Albright-Knox Art Gallery; image source; larger image
This is the famous "Mirrored Room" at the Knox-Albright Art Gallery. If you look closely, you can see:
-- a table and chair, which are covered with mirrors, like the walls
-- the hood around the camera that was used to take the picture.
To learn more about multiple reflections, visit this Physics Classroom page, and also see the simulation Multiple Reflections from Two Plane Mirrors.
(This feature was updated on August 13, 2013.)
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The Photoelectric Effect
Once you have clicked on the "simulation" link below, be sure to read the Java Security Advisory before running the simulation: To do that, click the "Read now" button on the yellow band near the top of the PhET page.
Check out the PhET simulation The Photoelectric Effect from the University of Colorado to learn about the photon, and the photoelectric effect in particular. For more, visit The Photoelectric Effect, from Physics 2000.
(This feature was updated on May 5, 2013.)