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)