Question

The linear magnification of image formed by convex mirror focal length 15 is 1/3. What is the distance of object from focus of the mirror?

Answer 1

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Question:- the linear magnification of image formed by convex mirror focal length 15 is1/3 .what is the distance of the obj from focus of the mirror

ANSWER:-

=> V= Uf/(U-f)

=> V=15U/( U-15)

=>. M=-V/U

=> 1/3=-{(15U)/( U-15)}/u

=> 1/3=-15/U-15

=>-45=U-15

=> U=-30

Therefore the focus of the mirror is 45cm

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Hope it helps