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Q.

The periscope works upon the principle of [[1]] of light.


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Detailed Solution

The periscope works upon the principle of reflection of light.
 Periscope: It is an instrument for observation from hidden positions. It works upon the principle of reflection of light. It consist of a tube with mirrors at each ed set parallel to each other at 450. These forms periscope, with the addition of two lenses for observation. It is used in submarines to see nearby from the depth of the sea.
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