Magnification | Power Of A Lens | Science Class 10 | Maharashtra Board


Magnification :-
The magnification due to a lens is the ratio of the height of the image (h2) to the height
of the object (h1).

Magnification =
Height of the Image/Height of the object
i.e. M = .h2/h1

The magnification due to a lens is also related to the distance of the object (u) and that
of the image (v) from the lens.
Magnification =
Distance of the Image/Distance of the object

i.e. M = v/u

Power of a lens :-
The capacity of a lens to converge or diverge incident rays is called its power (P). The
power of a lens depends on its focal length. Power is the inverse of its focal length (f);
f is expressed in meters.
The unit of the power of a lens is Dioptre (D).

P =
1/f(m)
1Diopre = 1/1m




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