Question

A convex lens has a focal length of 20 cm, Determine the position of the object for which the image will be half the size of the object..

Answer 1

Given f=20cm

m=1/2

but,m=-v/u

1/2=-v/u

v=-u/2

1/v=-2/u

We know 1/f=1/u+1/v

=1/20=1/u-2/u

=-1/u=1/20

=u=-20

The answer is 20 cm behind the lens.

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Answer 2

Explanation:

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