Question

A convex lens of focal length 30 cm produces a real image 3 times magnified. Find the object distance.

Answer 1

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Answer 2

HEY YOUR ANSWER ...

Given:f = 20 cm

m = -3 = v/u

v = -3u

Lens formula: 1/v - 1/u = 1/f

                         1/(-3u) - 1/u = 1/20

        - 4/(3u) = 1/20

            3u = - 4 x 20

               u = -80/3 = - 26.6 cm

The object is at a distance of 26.6 cm to the left from the optic centre of the lens.

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