360/15 - 1 = 23
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When two plane mirrors are tilted at an angle of 60 degrees, there are 5 images will be formed.
In 'a' plane mirror only 'one' image is formed.
5 images will be formed and how when two plane mirror are tilted at an angle of 60 degree
360/72 = 5 so there will be 5-1 = 4 images.
If 2 mirrors are placed perpendicular to each other then infinite no of images will be formed because image formed by one mirror will act as the object for the other and vice verse.