Question

Explain the nature of the image formed in a periscope.

Answer 1

Hint: In order to solve this question, we are going to first define what a periscope and how it is formed and the orientation of the mirrors in it and we will also explain the formation of the image through the periscope, its process and the nature of the image so formed .

Complete step-by-step solution:
A periscope is an instrument which is used for observing over, around and through an object or an obstacle. Such an object is prevented from the line of sight of the observer.
A periscope is composed of an outer case which has mirrors at each end at an angle of\[{45^ \circ }\]. These mirrors are placed parallel to the surface. Now the structure of a periscope is such that there are two lateral inversions of the image that is formed. These two lateral inversions cancel each other thus, the nature of the image formed in a periscope is not inverted.
The image formed by a plane mirror is virtual and laterally inverted. Now, when a ray reflected by the first mirror forms the incident ray for the second one, this laterally inverted incident ray gets reflected again by the second mirror. It results in a virtual image without lateral inversion. These resulting two laterally inverted images cancel each other.

Note: It is important to note that other than viewing objects that are prevented from the line of sight, periscope has other applications too. It is used in submarines to decide the time of attack, in nuclear reactors to observe the chemical reactions and the military to observe while hiding in places.