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What is an aberration, in the context of a real lens forming an image?
AA distortion in the image produced by the lens
BThe exact focal point predicted by the thin-lens equation
CThe magnification produced by a converging lens
DThe unit in which lens power is measured
Answer & Solution
Correct answer: A. A distortion in the image produced by the lens
1. An aberration is a distortion in the image that a real lens produces.
2. Real lenses behave somewhat differently from the ideal, ray-diagram or thin-lens-equation model, and aberrations are one reason why.
3. Magnification and the unit diopter are unrelated quantities, not distortions, so neither matches this definition.
_Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.3 Lenses_
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