what is focal power of a sphericle mirror or a lens
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Rays of light parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature. That makes this a converging mirror and the point where the rays converge is called the focal point or focus .
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Explanation:
the focal power of a sphericle mirror or a lens are equal to 1÷p
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