Ray Optics and Optical Instruments - Result Question 43
45. The focal length of converging lens is measured for violet, green and red colours. It is respectively
(a)
(c)
(b)
[1997]
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Answer:
Correct Answer: 45. (c)
Solution:
- (c) Red light has wavelength greater than violet light. Therefore focal length of lens for red is greater than for violet.
Cauchy relation
