what is magnification of a lens or mirror. (class 10)
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Magnification of a lens is defined as the ratio of the height of image to the height of object. It is also given in terms of image distance and object distance.
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It is the ratio of image length to the object length measured in planes that are perpendicular to the optical axis.
Linear magnification of a mirror is -v/u and in the lens its v/u. Negative in the mirror and positive in the lens
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