Chapter - 6 Light

Q&A -Ask Doubts and Get Answers

Q
Light

Question:

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm? 

Answer:

As both the mirrors are kept parallel to each other, therefore an infinite number of images will form due to multiple reflection between them.

This can be explained geometrically as shown in the figure. M1 and M2 are two parallel plane mirrors enclosing a point P whose image is P1 due to mirror M2 and P2 due to mirror M1. P3 is an image of P2 due to mirror M2 and P4 is the image of P1 due to M1. This continues so on and the infinite number of images are formed by two parallel plane mirrors enclosing an object.


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