Distinguish Plane mirror, Concave mirror and Convex mirror without touching

How will you identify a plane mirror, a concave mirror and a convex mirror without touching their surface?

Answer:

If you look into a plane mirror, you can find that the size of the image is same as that of the object.

If you look into a concave mirror, you can see an enlarged image when placed close and can see an inverted image when kept away.

A convex mirror always forms a small and erect image.

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