Question

Two point objects are placed on principal axis of a thin converging lens. One is 20 cm from the lens and other is on the other side of lens at a distance of 40 cm from the lens. The images of both objects coincide. The magnitude of focal length of lens is

A

B

C

D

Hard
Solution
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Correct option is A)

Let the two objects be
For

Now,  and
Putting back the values, 

Similarly, for ,

Solving the 2 eqns simultaneously for f, we get f =

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