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what is a periscope?

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Periscope is a device used to see the far objects. It is used in submarines to see the things on the surface. It works on the principle of multiple images formed by the plane mirror.

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A periscope is an instrument for observation from a concealed position. In its simplest form it consists of a tube with mirrors at each end set parallel to each other at an angle of 45. Commonly periscope is used in submarines for viewing the surface of water.
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A periscope is an instrument for observation from a concealed position. In its simplest form it consists of a tube with mirrors at each end set parallel to each other at an angle of 45. Commonly periscope is used in submarines for viewing the surface of water.
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Periscope is an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.

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A periscope is an optical device that allows an observer to see things beyond his or her line of sight. One of its classical uses is in submarines: instead of needing to surface to see what is going on at sea level, the submarine can instead stay safely submerged under the water and extend a periscope to look around. These devices are widely used in the military, but also in other fields, such as medicine and hunting.

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Periscope is an instrument for observation from a concealed position. In its simplest form it consists of a tube with mirrors at each end set parallel to each other at an angle of 45. Commonly periscope is used in submarines for viewing the surface of water

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