A concave mirror is called a converging mirror because a parallel beam of rays incident on a concave mirror converges after being reflected through it.
For a spherical mirror of small aperture, focal length (f) is half the radius of curvature (R).
f = R/2,
`rArr` R = 2f
This relationship is true for both concave and convex mirrors.
Higher the radius of curvature of a mirror, longer is the focal length and lesser is the magnification of the image with respect to the object size.
Thus for a less curved converging mirror, the focal length will be shorter when compared to a more curved mirror.
oic, thanks for answering