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Q.

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
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