Question

How to distinguish between plane concave and convex mirror without touching 10th?

Answer 1

Without touching if you look at Concave mirror you will look enlarged and erect.
If you look at Convex mirror you will look diminished and erect.
If you look at Plane mirror you will look erect and of the same size.


Hope it helps mate...

Answer 2

The image formed by concave mirror will be enlarged (provided that the object is beyond its focus) and real and inverted (provided that the object is not between focus and pole of the mirror).

The image formed by convex mirror will be diminished, virtual and erect.

The image formed by plane mirror will be virtual, erect and of same size as of the object.