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Question

Two lenses of focal lengths +10 cm and 15cm when put in contact behave like a convex lens. They will have zero longitudinal chromatic aberration if their dispersive powers are in the ratio
  1. +3/2
  2. +2/3
  3. 3/2
  4. 1/2

A
1/2
B
+2/3
C
3/2
D
+3/2
Solution
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For achromatic aberration:

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