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A convex lens of focal length 10 cm is p...

A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. What is the nature and focal length of the combination ?

A

Concave, 10 cm

B

Convex, 10 cm

C

Concave, 20 cm

D

Convex, 20 cm.

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