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A convex lens of focal length 5 cm is used in the combination with a concave lens of unknown focal length to form an achromatic combination. If the dispersive powers of the lenses are in the ratio 2:3 respectively. Then the value of focal length of concave lens will be : |
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Answer» A convex lens of focal length 5 cm is used in the combination with a concave lens of unknown focal length to form an achromatic combination. If the dispersive powers of the lenses are in the ratio 2:3 respectively. Then the value of focal length of concave lens will be : |
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