An object is placed between two parallel plane mirrors. Why do the distance images get fainter and fainter ?

When an object is placed between two parallel mirrors, then number of images formed are

When an object is placed between two parallel mirrors, then number of images formed are

Fill in the blank spaces with appropriate answers: An object is placed between two parallel mirrors. The number of images formed is _________.

The number of images observable between two parallel plane mirrors is

A point object is placed midway between two plane mirrors a distance apart. The plane mirrors form an infinite number of images due to multiple reflections. The distance between n^(th) order images formed in the two mirrors is