An instrument used by submarines to observe objects above the surface of the water is a __________.

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Solution

A periscope is an optical instrument that uses a system of mirrors and prisms which reflect images through the tube of the instrument.
A periscope is used in submarines.
With the help of a periscope, we can see objects above the surface of the water.
Hence, an instrument used by submarines to observe objects above the surface of the water is a periscope.

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