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Radii of curvature of a converging lens ...

Radii of curvature of a converging lens are in the ratio `1 : 2`. Its focal length is 6cm and refractive index is 1.5. Then its radii of curvture are _____ respectively.

A

9 cm and 18 cm

B

6 cm and 12 cm

C

3 cm and 6 cm

D

4.5 cm and 9 cm.

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