define principal focus and write down its relation with radius of curvature
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Principal focus of a concave mirror is a point where light rays parallel to principle axis converge. The distance between pole of mirror to point of principle focus is focal length of mirror. Focal length of spherical mirror is half of its radius of curvature.
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principal focus :
the point where all the light rays meet at a point to form an image.
it is a pont on principal axis.
it is represented with letter (F)
F=R/2
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