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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. What are their individual focal lengths (in cm)?

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a

- 75, 50

b

- 10, 15

c

75, 50

d

- 15, 10

answer is D.

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Detailed Solution

f1f2=23    .     .     .i1f1−1f2=130     .    .     .iiSolving  equations  i   and   iif2=−15 cm           (concave)f1=10 cm               (convex)
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