Derive and discuss the condition of achromatism for two thin lenses of focal length f1 and f2, when they are made of different materials but placed in contact.
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Chromatic aberration occurs when a lens is either unable to bring all wavelengths of color to the same focal plane, and/or when wavelengths of color are focused at different positions in the focal plane.
A combination of converging and diverging lenses can form a non chromatic aberration image
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