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Question
Two lenses of focal lengths
$+10$
cm and
$−15$
cm when put in contact behave like a convex lens. They will have zero longitudinal chromatic aberration if their dispersive powers are in the ratio
A
$+3/2$
B
$+2/3$
C
$−3/2$
D
$−1/2$
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Solution
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Correct option is B)
For achromatic aberration:
$f_{1}w_{1} +f_{2}w_{2} =0$
$w_{2}w_{1} =f_{2}−f_{1} $
$=(−15)−10 $
$=3+2 $
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