explain how a perisope work.
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Periscope is very useful in wars
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A periscope is designed in such a way that it helps to see the objects at a height without the person needing to reach at that height... There are two mirrors placed at an angle of 45 degrees. They are arranged in such a way that the light travelling into the upper opening of the periscope hits the upper mirror and reflects to the mirror at the below of the periscope. Finally it reaches the observer's eye making him visible to the object.....
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