Question

what is a periscope and its working

Answer 1

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.
A periscope works by using two mirrors to bounce light from one place to another. A typical periscope uses two mirrors at 45 degree angles to the direction one desires to see. The light bounces from one to the other and then out to the persons 

Answer 2

Answer:A periscope works on the law of reflection.the light from the object falls on one mirror and is reflected.this reflected light in turn falls on another mirror and is again reflected until it reaches the human eye

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