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You are given three mirrors of different types. How will you identify each one of them?
 
If it is a plane mirror, then the image size on the mirror  as the object size. The image formed in the mirror will always be .
 
If it is a concave mirror, then the image formed and can be . It may also be , depending on the distance of the object.
 
If it is a convex mirror, then the image formed will always be , whatever the distance may be.