Question

Why are multiple images formed when 2 mirrors are placed at right angles to each to other?


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Answer 1

We get many images of the objects because the image formed by one mirror acts as an object for the second mirror. Further images of an image are also formed. This continues till no more reflection by either mirror is possible. This phenomenon is referred to as multiple reflection. So, we get 3 images by the process of n = 360/Theta( The angle at which mirrors are placed ) - 1.
Therefore, 360/90 - 1 = 4 - 1 = 3.
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Answer 2

If two plane mirrors are placed together on one of their edges so as to form a right angle mirror system and then the angle between them is decreased, some interesting observations can be made. One observes that as the angle between the mirrors decreases, the number of images that can be seen increases.