What will be the focal length of convex mirror whose radius of curvature is 30 cm?

-15 cm

For spherical mirrors of small apertures, the radius of curvature is found to be equal to twice the focal length.

We put this as R = 2f of f = \(\frac{R}{2}\)

This implies that the principal focus of a spherical mirror lies midway between the pole and centre of curvature.

For convex mirror,

R = +30 cm

f = \(\frac{R}{2}\) = \(\frac{30}{2}\) = 15 cm