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An achromatic doublet reduces chromatic aberration by combining which two lens types?
AA converging crown-glass lens with a diverging flint-glass lens
BTwo converging lenses made from the same crown glass
CTwo diverging lenses made from the same flint glass
DA single lens ground from a mixture of both kinds of glass
Answer & Solution
Correct answer: A. A converging crown-glass lens with a diverging flint-glass lens
1. Chromatic aberration in a single convex lens comes from the lens material's index of refraction changing with wavelength.
2. An achromatic doublet pairs a converging lens made of crown glass with a diverging lens made of flint glass, in contact with each other.
3. The two lenses have different dispersions, so the doublet can reduce chromatic aberration dramatically compared with a single lens.
4. Using two lenses of the same glass and the same shape would not supply the differing dispersions this correction needs.
_Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.3 Lenses_
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