Discussion
Chromatic aberration arises in thick lenses due to
Answer: E
Chromatic aberration is due to dispersion of light.
The refractive index of glass depends on wavelength: it is larger for violet than for red. A lens therefore brings different colours to slightly different foci, so a white-light image shows coloured fringes. That variation of refractive index with colour is dispersion.
Refraction alone, with one refractive index, would focus all colours at the same point, so 'refraction' is not the specific cause. Scattering, interference and reflection play no part in forming the lens image.
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