Easy
Two plane mirrors are arranged side by side such that reflecting surfaces face each other with 90 deg between them. Maximum number of images seen when an object is placed between them is:
Explanation
Explanation
For two plane mirrors inclined at angle theta, the number of images formed = (360/theta) - 1. Here theta = 90 deg, so number of images = (360/90) - 1 = 4 - 1 = 3.
PRO TIP
Re-check your working by substituting the answer back into the original question.