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A combination of two thin lenses with fo...

A combination of two thin lenses with focal lengths `f_(1)` and `f_(2)` respectively forms and image of distant object at distance `60cm` when lenses are in contact. The position of this image shifts by `30 cm` towards the combination when two lenses are separated by `10 cm`. The corresponding values of `f_(1)` and `f_(2)` are

A

30 cm, -60 cm

B

20 cm, -30 cm

C

15 cm, -20 cm

D

12 cm, -15 cm

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The correct Answer is:
B
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