How does the focal length of a convex lens change when monochromatic red light is used instead of monochromatic blue light
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Refractive index of red light is less than the refractive index of blue light. i.e., nR < nv. So, the focal length of the lens will increase when red light is used.
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Focal length of the convex lens increases with the increase in wavelength. We know wavelength of red is more than the wavelength of violet.
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