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The problem of myopia is corrected by using convex lens of suitable focal length.

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The problem of myopia is corrected by using concave lens of suitable focal length.
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An achromatic lens-doublet is formed by placing in contact a convex lens of focal length 20 cm and a concave lens of focal length 30 cm. The dispersive power of the material of the convex lens is 0.8. Determine the dispersive power of the material of the concave lens. Calculate the focal length of the lens-doublet.

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