English example sentences with "periscope"

The submarine's periscope was sticking right out of the water.
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Tom looked through the periscope.
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The periscope allows the crewmen of the submarine to see everything that happens above the surface.
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Lower the periscope.
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He looked at the two enemy submarines through the periscope. They were in danger and he knew it, but how were they going to escape from them?
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Up periscope!
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Down periscope!
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The submarine's periscope was sticking out of the water.
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In the woods, Felix came across a periscope pipe protruding from the ground.
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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. At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer’s eye. This simple periscope uses only flat mirrors as compared to the periscopes used on submarines, which are usually a complex optical system using both lenses and mirrors.
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