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Q.

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3. Their equivalent focal length is 30 cm. Their individual focal lengths are

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a

-75 cm, 50 cm

b

- 10 cm, 15 cm

c

- 50 cm, 75 cm

d

- 15 cm, 10 cm

answer is D.

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