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A person has a normal near point 25 ~cm . What is the magnifying power of the simple microscope he used, if the focal length of the convex lens used is 10 ~cm and the final image is formed at the least distance of distinct vision?

Options

  1. A25
  2. B3.5
  3. C7
  4. D2.5

Correct answer

B. 3.5

Step-by-step solution

The magnifying power M of a simple microscope when the final image is formed at the least distance of distinct vision D is given by the formula: M = 1 + D f Given values are: Least distance of distinct vision D = 25 cm Focal length of the convex lens f = 10 cm Substituting these values into the formula: M = 1 + 25 10 M = 1 + 2.5 M = 3.5 Answer: 3.5

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