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A bi-convex lens has radius of curvature of both the surfaces same as 1/6 cm. If this lens is required to be replaced by another convex lens having different radii of curvatures on both sides (R 1 ≠ R 2 ), without any change in lens power then possible combination of R 1 and R 2 is :

1. 5 1 cm and 7 1 cm
2. 3 1 cm and 7 1 cm
3. 6 1 cm and 9 1 cm
4. 3 1 cm and 3 1 cm

Correct answer: 5 1 cm and 7 1 cm

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