what is the focal length of mirror explain. write 3 mark answer
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Focal length.
Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.
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Answer: The focal length ( f ) is the distance from a lens or mirror to the focal point ( F ). This is the distance from a lens or mirror at which parallel light rays will meet.
So for the case of a concave mirror, it is the point at which all collimated (parallel) light rays entering the mirror being reflected and converged to a point in front of the mirror. The point of convergence (focus) is the focal point. As to how and why this is useful, the wikipedia page also touches on that.
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