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Chromatic Aberrations

Will focal le...

Question

Will focal length of a lens for a red light be more, same or less than that for a blue light?

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Solution

If you are talking about focal lenth of a lens, then remember that focal length of a lens for a particular color of light depends upon the refractive index of the material of the lens. And refractive index is inversely proportional to the wavelenth of light. Also, in case of a lens, large the value of refractive index shorter is the focal length. Since wavelenth of red light is more than that of blue light, focal length for red light will be more than that for blue light.

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