Question

the image formed by a convex mirror of focal length 20 cm is a quarter of the object.What is the distance of the object from the mirror?

Answer 1

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Answer 2

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1/4 = -v/u

-4v = u

-v = u/4

1/f = 1/v + 1/u

-4/v + 1/u = 1/f

-3/v = 1/20

u = -60cm