How do you find the focal length of a concave mirror?
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A concave mirror, like a plane mirror, obeys the laws of reflection of light.Rays of light from object - The rays of light coming from a distant object e.g. sun or a distant building can be considered to be parallel to each other. When these parallel rays of light fall on a concave mirror along its axis, reflect and meet at a point in front of the mirror, which is called as Principal focus of the mirror.
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the focal length of a mirror is defined as
f=R\2
where "R"=radius of curvature,
f=focal length
hope it helps
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