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(B) The refractive index of a lens material depends on the wavelength of light,as given by Cauchy's equation. Since white light consists of various co

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Chromatic aberration

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(B) The refractive index of a lens material depends on the wavelength of light,as given by Cauchy's equation. Since white light consists of various colours (wavelengths),each colour experiences a different refractive index when passing through the lens. Consequently,each colour focuses at a different point along the principal axis. This phenomenon,where a lens fails to focus all colours at a single point,is known as chromatic aberration.

When a beam of white light is allowed to pass through a convex lens parallel to the principal axis,the different colours of light converge at different points on the principal axis after refraction. This is called:

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