Question

What are a multiple images? How they are formed?

Answer 1

When two mirrors are kept at an angle and an object placed in between the mirrors, multiple images are formed due to reflection from one mirror on to the other.

The number of images of the object formed depends on the angle between the two mirrors.

$Numberofimagesformed=\frac{{360}^0}{Anglebetweenthemirrors}-1$