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A thin convex lens of focal length 10 cm...

A thin convex lens of focal length 10 cm and a thin concave lens of focal length 20 cm are in contact. The combination acts as :

A

Concave lens of focal length 10.0 cm

B

Concave lens of focal length 20.0 cm

C

Convex or concave lens depending on refractive index of material of the lens

D

None of the above.

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