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An object is placed 30 cm away from a co...

An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp image is formed on a screen. Now a concave lens is placed in contact with the convex lens. The screen now has to be moved by 45 cm to get a sharp image again. The magnitude of focal length of the concare lens is (in cm)

A

72

B

60

C

36

D

20

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