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A convex lens of focal length 10 cm and image formed by it, is at least distance of distinct vision then the magnifying power is

Options

  1. A3 . 5
  2. B2 . 5
  3. C1 . 5
  4. D1 . 4

Correct answer

A. 3 . 5

Step-by-step solution

The coverging lens used for magnification is called simple microscope or a magnifier. When image is formed at D , the least distance of distinct vision, then magnifying power M = 1 + D f Given, D = 25 cm, f = 10 cm ∴ M = 1 + 25 10 = 1 + 2.5 = 3.5

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