define magnification of mirror and also mention its formula and units
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Magnification is also equal to the ratio of image distance to the object distance. ... m=\frac{v}{u} As the object is always above the principal axis, the height of the object is always positive. But a sign for image height may vary according to the type of image formed.
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MAGNIFICATION IS ALSO EQUAL TO THE RATIO OF IMAGE DISTANCE TO THE OBJECT DISTANCE M=\FRAC {V}{U} AS THE OBJECT IS ALWAYS ABOUT THE PRINCIPAL AXIS THE HEIGHT OF THE OBJECT IS ALWAYS POSITIVE BUT A SIGN FOR IMAGE HEIGHT MAY VARY ACCORDING TO THE TYPES OF IMAGE FORMED.
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