An achromatic convergent doublet of two lenses in contact has a power $+2 \text{ D}$. The convex lens has power $+5 \text{ D}$. The ratio of the dispersive powers of the convergent and divergent lenses is (in magnitude)
- A$3: 5$
- B$2: 5$
- C$4: 5$
- D$5: 6$
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