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  • An achromatic convergent doublet has power of +2D. If power of convex lens is + 5D, then ratio of the dispersive powers of a convergent and divergent lenses will be<stro

An achromatic convergent doublet has power of +2D. If power of convex lens is + 5D, then ratio of the dispersive powers of a convergent and divergent lenses will be

Option: 1

3 : 5


Option: 2

2 : 5


Option: 3

2 : 3


Option: 4

None of these


Answers (1)

best_answer

\mathrm{ P=+2 D \quad \therefore P_1=+5 D \therefore P_2=-3 D \\ }

\mathrm{ \text { As } ~\frac{P_2}{P_1}=\frac{f_1}{f_2}=-\frac{w_1}{w_2}=-\frac{3}{5} \Rightarrow \frac{w_1}{w_2}=\frac{3}{5} }

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Divya Prakash Singh

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