How many plane mirrors are used in the construction of a periscope? How are they arranged in relation to one another?

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Two parallel perpendicular lines

Four parallel to one another

Four perpendicular to each other

Two parallel to one another

answer is D.

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Detailed Solution

Concept: A periscope is an instrument that consists of two mirrors or reflecting prisms that are used to change the direction of the light coming from the sight being observed. In this case, the first mirror deflects the light downward through a vertical tube, while the second diverts it horizontally, allowing for a more precise view of the sight.
The simplest periscope model is a tube with two mirrors at the ends that are parallel to each other but at a 45° angle with the tube's axis. This device does not provide magnification and does not provide a cross line image. The simple geometry of the tube limits vision.
So, here the two mirrors are getting aligned in a parallel manner.
Hence, the correct option is 4.

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