Optics Question 639
Question: The focal length of a convex lens depends upon
[AFMC 1994]
Options:
A) Frequency of the light ray
B) Wavelength of the light ray
C) Both (a) and (b)
D) None of these
Show Answer
Answer:
Correct Answer: B
Solution:
$ f\propto \frac{1}{\mu -1} $ and $ \mu \propto \frac{1}{\lambda } $