What is periscope? And how does reflections help in submarines. How are submarine useful for every country’s security?
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Periscopes can be used in many ways beyond seeing above water from a submarine. ...
The main part of a periscope is a long tube that has a mirror at each end. The mirrors are attached so that they are parallel to each other at a 45-degree angle. Arranged in this way, the mirrors bounce reflections of light between them.
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