Ray Optics and Optical Instruments - Result Question 48
50. Focal length of a convex lens will be maximum for
(a) blue light
(b) yellow light
(c) green light
(d) red light
[1994]
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Answer:
Correct Answer: 50. (d)
Solution:
- (d) For red light, focal length of lens is maximum because $f \propto \lambda$ and $\lambda$ is maximum for red light.
