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If R1 and R2 are the radii of curvature ...

If `R_1` and `R_2` are the radii of curvature of a double convex lens, the largest power will be when

A

`R_1 = oo, R_2=10 cm`

B

`R_1=10 cm, R_2=oo`

C

`R_1=R_2=10 cm`

D

`R_1=R_2=5 cm`.

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