PERISCOPE​


 

 A periscope is a useful example of the law of reflection of light.

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 In this it is important to place the two mirrors at an angle of 45° because light always reflects away from the mirror at the same angle and surface that it strikes.

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In a periscope light from an object strikes the upper mirror at 45° and is reflected at the same angle. This light beam goes straight down the tube and hits the bottom mirror and is reflected back at a 45° angle and sends a beam of light directly into your eye that allows you to see the object.

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Periscopes are used in submarines to view objects at sea and also in bunkers to observe objects on the surface from below the surface.​

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