Working Backwards Task - Hidden Optical Element



A drag-able source of light is shown along with an optic element  that has been hidden behind a pink curtain.  What is behind the curtain? Hint: Drag the light source around before making your answer.

Once you've made your best effort you can click on the answer to remove the curtain.


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Copyright 1999, 2000, 2001, 2005 - 2009 by Paul Williams
Last Updated: August 21, 2009