A small object of length l lies along the principal axis and at adistance u from concave mirror of focal length f the size of its image would be : options,a) l[f/(u-f)]^1/2b) l[(u-f)/f]^1/2c) l[f/(u-f)]^2please explain .all steps are necessary.
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in do not
under stand this puestion please
easily explain
ok iknow that but repetly
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