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Two point objects are placed on principa...

Two point objects are placed on principal axis of a thin converging lens. One is 20cm 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

`(80)/(3)cm`

B

`(40)/(3)cm`

C

40cm

D

`(20)/(3)cm`

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