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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

45^{0}

. 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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