It is desired to make a converging achromatic combination of mean foca – InterviewSolution

1.	It is desired to make a converging achromatic combination of mean focal length 50 cm by using two lenses of materials A and B. If the dispersive powers of A and B are in ratio 1:2. The focal length of the lens are
Answer» It is desired to make a converging achromatic combination of mean focal length $50 cm$ by using two lenses of materials $A$ and $B .$ If the dispersive powers of $A$ and $B$ are in ratio $1 : 2.$ The focal length of the lens are

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