Question

The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is:
A. two
B. five
C. one
D. three

Answer 1

Answer:

number of images=360/90-1

=4-1

=3 images will be formed.

Answer 2

The number of images formed between two plane mirrors inclined at right angles is D. three

Given:

Angle between two mirrors = θ = 90° = Right angle

To find:

Number of images = n = ?

Formula used:

$n=\frac{360}{\theta}-1$

Solution:

On substituting angle in above formula, we get,

$n=\frac{360}{90}-1$

$n=4-1$

$\therefore n =3$

When the angle between mirrors is 180° then only single image is obtained. If the angle decreases, then the number of images increases. If the angle increases, then the number of images decreases.