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Radii of curyature of a converging lens are in the ratio 1 : 2, Its focal length is 6 cm and refractive index is 1.5. Then its radii of curvature are …. Respectively. |
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Answer» 9 cm and 18 cm Let `R_(1) = R and R_(2) = 2R` We know the focal length of converging lens By USING relation `(1)/(f) = (mu - 1) [(1)/(R_(1)) + (1)/(R_(2))]` Substituting all the values, we get `R = 4.5 cm` `therefore R_(1) = 4.5 cm and R_(2) = 2 xx 4.5 = 9 cm` |
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