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Periscopes allow a submarine, when submerged at a shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull.
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When the submarine is upto 20 meters from the surface they use a periscope which is simply 2 pieces of glass at 45 degrees to each other. similar to the periscope used to view from a trench by the army.
The submarine
The captain of the submarine raised the periscope to see if there's danger.
The submarine's periscope and radar mast are damaged.
Periscope
red
Periscope.
In paintball wars, a periscope is a handy way to look around a corner without getting shot. With only its periscope out of the water, a submarine was nearly impossible to spot at a distance.
They use a periscope. See the related link for more information.
If you mean in the periscope, two.