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The focal length of a biconvex lens of R...

The focal length of a biconvex lens of R.I. 1.5 is 0.06 m. Radii of curvature are in the ratio 1 : 2.Then radii of curvature of two lens surface are

A

0.045 m, 0.09 m

B

0.09 m, 0.18 m

C

0.04 m, 0.08 m

D

0.06 m, 0.12 m.

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