A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 23. Their equivalent focal length is 30 cm. What are their individual focal lengths
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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 ----(i) 1f1−1f2=130 -----(ii) Solving equation (i) and (ii) f2=−15cm (Concave) f1=10cm (Convex)