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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 |
3 : 5 2 : 5 2 : 3 None of these |
3 : 5 |
$P = +2D$ $∴ P_1=+5D$ $∴ P_2=-3D$ As $\frac{P_2}{P_1}=\frac{f_1}{f_2}=-\frac{w_1}{w_2}=-\frac{3}{5}⇒\frac{w_1}{w_2}=\frac{3}{5}$ |
