Question

Image seen by a periscope is:
A. laterally inverted
B. longitudinally inverted
C. both A and B
D. neither A nor B

Answer 1

Hint: The periscope forms the image of an object by reflecting between the mirrors slanted parallel to each other. This type of reflection of light forms the image which is oriented the same as the object and we are able to view the objects from different elevations.

Complete step by step answer:

The diagram shows a drawing of a periscope. It consists of two glass mirrors which are placed parallel to each other as shown in the diagram. The light rays from the source are incident on the upper mirror at an angle of 45${}^{\circ }$. The upper mirror reflects this light towards the lower mirror striking it at the same angle of 45${}^{\circ }$.
The image formed is such that we can view an object at different elevation at our eye level. No inversion takes place in the image of the object since the light rays get reflected twice and finally travel in the same direction to the eyepiece as they came from the object.

Hence, the correct answer is option D.

Additional Information
The periscopes are used to view things that are not at our eye-level and can be used for military purposes also.

Note:
The basic working principle of periscope is the reflection of light in periscope which follows the simple laws of reflection that state that:
1. The incident ray of light, the reflected ray of light and the normal to the plane of the mirror, all lie in the same plane.
2. The angle of incidence of light is always equal to the angle at which the light gets reflected.