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Q: Lenses with two focal lengths are used by persons suffering from ……….
  • A. Myopia and hypermetropia
  • B. Myopia or hypermetropia
  • C. Myopia but not hypermetropia
  • D. Hypermetropia but not myopia
Correct Answer: Option A - Some people suffer from both myopia and hypermetropia. Such people require bi-focal lenses. The upper part of the bi-focal lens is a concave lens used for distant vision while its lower part is convex lens used for reading purposes
A. Some people suffer from both myopia and hypermetropia. Such people require bi-focal lenses. The upper part of the bi-focal lens is a concave lens used for distant vision while its lower part is convex lens used for reading purposes

Explanations:

Some people suffer from both myopia and hypermetropia. Such people require bi-focal lenses. The upper part of the bi-focal lens is a concave lens used for distant vision while its lower part is convex lens used for reading purposes