Define focus and focal sperichel mirror
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A spherical mirror is a mirror which has the shape of a piece cut out of a spherical surface. And focus is the center of concentration( If your talking about focus.)
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The principal focus of a spherical mirror is a point on the spherical mirror's principal axis where parallel light rays intersect (meet) or emerge to deviate after reflection; while, the focal length of a spherical mirror is the distance between the pole and the principal focus.
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