A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 53 . Their equivalent focal length is 60 cm. Their individual focal lengths are
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a
−48cm, 48.5cm
b
25cm,-50cm
c
−50cm,75cm
d
40cm,-24cm
answer is D.
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Detailed Solution
1F=1f1[f1f2−1] …… (1)f1f2=53 …….(2)from (1) and (2)∴f1=40cm f2=-24cm