Linear Magnification of Spherical Mirror


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Linear magnification is ratio of the size of the image to the size of the object.

We know,

linear magnification of spherical mirror

Concave Mirror

For Real Image

using sign convention

AlBl = -h2 ; AB = +h1

PBl = -V, PB = - u

linear magnification of concave mirror forming real image

For Virtual Image

AlBl = +h2 ; AB = h1

PBl = +V ; PB = -u

Convex Mirror

AlBl = +h2 ; AB = +h1

PBl = +v ; PB = -u

Note:

If m>1, image is enlarged.

If m <1, image is diminished.

If m is +ve , image is erect and virtual.

If m is -ve, image is inverted and real.

Other formulae for magnification

or

linear magnification of convex mirror forming real image

linear magnification of convex mirror forming virtual image



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