Question

hey dears answer this plz
...what is meant by magnification in the context of image formation by mirror and lenses

Answer 1

the ratio of the image to the height of the height of object is known as magnification. 
for a mirror magnification, m = -v/u and 
for a lens magnification , m  = v/u
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Answer 2

$\huge \mathfrak {ANSWER}$
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$\bold {Magnification \:in \:mirror}$ :-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.

$\bold {Magnification \:in \:Lenses}$ :- Magnification produced by a lens is also related to the object-distance u, and the image-distance v.This relationship is given by:- m = h'/h = v/u

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