Focal length, positive number with a concave mirror, negative for a convex mirror.
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1/object distance + 1/ image distance = 1/focal length
A concave mirror is a spherical mirror with a reflective inside surface. When the reflective surface is made more curved, the distance between the focal point and the surface increases. A concave mirror can form both virtual or real images.
The focal length of a concave mirror is about equal to half of its radius of curvature.
It is the point , on the central axis, where light, that is parallel to the central axis, passes thru after it is reflected from the mirror. It is also at a distance from the mirror equal to twice the radius of curvature of the mirror.
I don't think so. The focal length would remain the same. It mainly depends on the radius of curvature of the mirror.