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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

An achromatic convergent doublet of two lenses in contact has a power of D. The convex lens has power D. What is the ratio of the dispersive powers of the convergent and divergent lenses?

Answer: (B)

Solution

The power of the concave lens is D; achromatism requires , so

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Question ID VK-069394