Question

which is the polished and reflecting surface in concave and convex mirror?

Answer 1

one side of the spherical mirror is opaque and the other side is a highly polished reflecting surface. In a diagram the opaque side of a mirror is always shown shaded
Concave mirror is a spherical mirror whose reflecting surface is towards the center of the sphere of which the mirror is a part
Convex mirror is a spherical mirror whose reflecting surface is away from the center of the sphere of which the mirror is a part.

Answer 2

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Concave mirror :

In a concave mirror , the polished and the reflective surface is curved inward and non reflecting surface is curved outwards .

Convex mirror :

In a convex mirror the reflecting surface is curved outwards and non reflecting surface is curved inwards.

Hope it helps