The refractive index of glass with respect to air is 1.53 and that of water with respect to air is 1.33. Then a convex lens whose focal length in air is 20 cm, when fully immersed in water would have the focal length |
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(a) |
20 cm |
(b) |
3.9 cm |
(c) |
70.49 cm |
(d) |

The refractive index of glass with respect to air is 1.53 and that of water with respect to air is 1.33. Then a convex lens whose focal length in air is 20 cm, when fully immersed in water would have the focal length |
|||||||

(a) |
20 cm |
(b) |
3.9 cm |
(c) |
70.49 cm |
(d) |

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