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An achromatic lens-doublet is formed by ...

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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