Answer:
Hey mate !
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▪Magnification:-
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☆Magnification produced by a spherical mirror or lens can be defined as the ratio of the height of the image to that of the object.
☆If we take h as the height of the object and h' as the height of the image, then the Magnification produced by the mirror or lens will be:-
Magnification, m = h'/h
☆The sign of the Magnification for real image is taken to be as (-)ve and it is taken as (+)ve for virtual images.
Hope it helps !