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Waves

Light - Total Internal Reflection - Periscope.

Two right angle prisms can be used to form a periscope, as shown below.
Total internal reflection occurs at the back face of the prisms.

A periscope may be used by people
(i)  in a submarine to see above the sea surface
(ii)  to see over the heads of people in a crowd.

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Copyright © 2008 Dr. Colin France. All Rights Reserved.