An incident ray parallel to the principal axis of convex spherical surface
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An incident ray parallel to the the principal axis after reflection by a convex spherical surface appear to diverge from a point on the principal axis called the principal focus(F) or focal point of the spherical mirror.
The distance between the principal focus and the center of curvature (C) is called the focal length. The focal length is always positive for a convex mirror.
Answered in Detail:-
An incident ray parallel to the the principal axis after reflection by a convex spherical surface appear to diverge from a point on the principal axis called the principal focus(F) or focal point of the spherical mirror.
The distance between the principal focus and the center of curvature (C) is called the focal length. The focal length is always positive for a convex mirror.
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