Question

how will you distinguish between a plane mirror concave mirror and convex mirror without touching them? (very short answer give me please)

Answer 1

convex mirror used in vehicle as a rear view mirror
concave mirror used in shop of barber

Answer 2

in plane mirror image size is same as that of object size.
in concave mirror the size of image increases
in convex mirror the size of image decreases

hope it will help you :-)