A periscope.
To see over walls and in submarines
A Periscope or Radar
periscope
A standard viewing device used on a submarine is a periscope.
Yes sonar can be used at periscope depth. Surface ships also have sonar arrays on them. They are usually used to detect submarines.
PERISCOPE
Periscopes were used to watch and observe and spy on the enemy lines during the war and are still used in submarines
Periscopes were used to watch and observe and spy on the enemy lines during the war and are still used in submarines
The instrument used in submarines to observe the surface of water is called a periscope. A periscope consists of a long tube with mirrors at each end, allowing the viewer to see objects above the water's surface while the submarine remains submerged. The periscope's mirrors reflect light from the surface down the tube to the viewer, providing a view of the surroundings without the need to surface the submarine.
A periscope is used to observe the surface from a submarine
The Captain used the periscope to locate the enemy ships.A periscope is the eye of a submarine.