Question

Find the maximum number of images that can be seen in a periscope.*
(1 Point)
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1
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3​

Answer 1

Answer:

3

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Answer 2

Maximum number of images seen in periscope are 3.

Explanation:

• A periscope is an optical instrument that uses a system of prisms, lenses or mirrors to reflect images through a tube.

• The periscope is an instrument for observation over, around or through the object, obstacle or condition that prevents direct line-of-sight observation from the observer’s current position.

• The periscope is used to monitor the dangerous chemical reactions in the laboratory and they are used in observing nuclear reactors.

• Light from a distant object strikes the top mirror and is then reflected at an angle of $90^{o}$ down the periscope tube.

• At the bottom of the periscope, the light strikes another mirror and is then reflected into the viewer's eye.

• A 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.

Number of images ($n$) formed can be calculated by:

$n=(360^{o} /x)-1$, Where $x$ is the degree at which both the mirrors are inclined i.e. the angle made between both the mirrors. Here $x$ is $90^{o}$.

Therefore, number of images in periscope are 3.