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What kind of spectacle lens corrects nearsightedness, and how does it help?
AA converging lens, which increases the eye's power
BA diverging lens, which reduces the eye's power
CA flat lens, which leaves the eye's power unchanged
DA mirror, which reflects light back onto the retina
Answer & Solution
Correct answer: B. A diverging lens, which reduces the eye's power
1. A nearsighted eye overconverges light because its focal length is too short.
2. Correcting this uses a diverging spectacle lens, which reduces the power of an eye that has too short a focal length.
3. A converging lens would only make the overconvergence worse, and a flat piece of glass changes no power at all.
_Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.3 Lenses_
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