If R1 and R2 are the radii of curvature of double convex lens made of same material, the lens with more focal length is

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R1 = 20 cm, R2 = 10 cm

R1 = R2 = 20 cm

R1 = R2 = 10 cm

R1 = R2 = 5 cm

answer is B.

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Detailed Solution

1f=(μ−1)(1R1+1R2) 1f∝(120+110)∝320 1f∝(120+120)∝110 1f∝(110+110)∝210 1f∝(15+15)∝410

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