A) red light
B) yellow light
C) green light
D) blue light
Correct Answer: A
Solution :
From lens makers formula \[\frac{1}{f}=(\mu -1)\left( \frac{1}{{{R}_{1}}}-\frac{1}{{{R}_{2}}} \right)\] \[f\propto \frac{1}{(\mu -1)}\] \[f\propto \frac{1}{\mu }\] \[\Rightarrow \] \[\mu \propto \frac{1}{\lambda }\] So, \[f\propto \lambda \] But wavelength of red light is more as compared to other given light. Hence, focal length of convex lans is maximum for red light.You need to login to perform this action.
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