Question

how can you differentiate between concave and convex mirror by touching

Answer 1

If the inner side of the spherical mirror is reflecting, it is called a concave mirror. If the outer side of the spherical mirror is reflecting, it is called a convex mirror. Concave mirrors can form inverted and real images and also virtual and erect images.

Answer 2

Concave is inwardly folded....Like a cave inside hollow

And convex is outwardly folded that is outwardly bulged

Hope helps