Multiple choice

Convex lenses are used for the correction of

  1. long sightedness

  2. short sightedness

  3. cataract

  4. None of these
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A Correct answer
Explanation

Convex lenses are converging lenses that bring light rays to a focus. Long sightedness (hypermetropia) occurs when the eyeball is too short or the lens too weak, causing images to focus behind the retina. A convex lens adds focusing power to bring images forward onto the retina. Short sightedness requires concave (diverging) lenses instead.

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