A) 1 : 3
B) 2 : 3
C) 3 : 2
D) 3 : 1
Correct Answer: B
Solution :
Condition for achromatic lens couple is \[\frac{{{f}_{1}}}{{{f}_{2}}}=-\frac{{{\omega }_{1}}}{{{\omega }_{2}}}\] \[\frac{{{\omega }_{1}}}{{{\omega }_{2}}}=-\frac{2}{3}\] \[\therefore \] ratio of dispersive powers is \[~-2:3\]You need to login to perform this action.
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