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2:56
YouTube
Educational Videos
Periscope
What is a Periscope Periscope is an optical instrument which uses a system of prisms, lenses, or mirrors to reflect images through a tube. In this instrument, plane mirrors are used to fold light so that the image of an object can be brought down to a lower level. The essential parts of a periscope are a tube, prisms, lenses, mirrors, and an ...
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Mar 19, 2013
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