How many images will be formed if two mirrors are placed at an angle of $40°$?

Step 1: Formula for image formation at an angle

We know that the number of images formed by two mirrors inclined towards each other at an angle $\theta$ is given by

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

In the question, it is given that the mirrors are placed at an angle $40°$

Hence $\theta =40°$

Step 2: Calculate the number of images

Therefore, the number of images formed by these two mirrors,

$n=\frac{360}{40}-1$

$=9-1$

$=8$

Hence, the number of images formed by these two mirrors are $8$.