A periscope lets you look around walls, corners or other obstacles. ... A periscope is a useful example of the law of reflection at work. It's important that your mirrors are placed at a 45° angle, because light always reflects away from a mirror at the same angle that it hits it.

What is a periscope and its uses?

A periscope is an optical instrument that uses a system of prisms, lenses or mirrors to reflect images through a tube. Light from a distant object strikes the top mirror and is then reflected at an angle of 90 degrees down the periscope tube.

Where periscope is used and why?

Uses Of Periscope

It is used in submarines to determine the distance of a torpedo and helps in deciding the right time for the attack. It is used in a nuclear reactor to observe the chemical reactions that are taking place. In military periscopes are used to observe from their hiding position.