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?
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.