GENERAL KNOWLEDGE

Detailed explanation-1: -Hence, an instrument used by submarines to observe objects above the surface of the water is a periscope. Q. A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water.

Detailed explanation-2: -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.

Detailed explanation-3: -Periscope is an instrument used in submarines to observe activity above the water surface while the submarine is submerged. Periscope consists of an outer case with mirrors at each end set parallel to each other at a 45° angle. More complex periscope uses the prisms or advances fiber optics instead of mirrors.

Detailed explanation-4: -Submarines have periscopes so that people inside can what is on the surface of the water. 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.

Detailed explanation-5: -Periscope is used in submarines, tanks and also by soldiers in bunkers to see things outside.