Will the focal length of a lens for red light be more, same or less th – InterviewSolution

1.	Will the focal length of a lens for red light be more, same or less than that for blue light?
Answer» As the refractive index for red is less than that for blue, parallel beams of light incident on a lens will be bent more towards the axis for blue light compared to red. Thus the focal length for blue light will be smaller than that for red.

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