A) Red light
B) yellow light
C) Green light
D) blue light
Correct Answer: A
Solution :
From the relation \[f\propto \frac{1}{(\mu -1)}\] and also \[\mu \propto \frac{1}{\lambda }\] Therefore, \[f\propto \lambda \] We know that \[{{\lambda }_{r}}>{{\lambda }_{v}}\] Therefore, focal length will maximum for red light.
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