Periscope consists of plane mirrors facing each other fixed to a frame at an angle of
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The angle is 45 degrees.
A periscope is an instrument, used to look around obstacles. It consists of three straight tubes, attached in the shape of letter "S". There are 2 mirrors placed at the corners, at an angle of 45 degrees, such that the mirrors face each other.
Lights reflects away from a plane mirror at the same angle it hits it. So in the periscope, the light falls on first mirror and is reflected onto the second mirror.
A periscope is used in submarine to view to a distance of 7 to 8 nautical miles.
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