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Define the term magnification.What do you mean by positive and negative values of magnification? Write the formula for magnification of a mirror and a lens explaining the symbols used in the formula.

magnification produced by spherical mirror is given by the ratio of size of a image and the size of an object.

magnification=size of a image / size of an object

m=h'/h = -v/u

NOTE : m is -ve for real image but +ve for virtual image

hence, magnification for convex mirror is always +ve while for concave mirror it depends upon the nature of the image.

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Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called "minification" or "de-magnification
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A negative sign in the value of the magnification indicates that the image is real and A positive sign in the value of the magnification indicates that the image is virtual.
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Formula for magnification of  mirror is -v/u and the formula for magnification of lens is v/u.
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Srry dnt post it in single post....due to technical problem...
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okkok
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