Multiple choice

An optical instrument gives the magnifying power which is

  1. max. for normal adjustment

  2. max. for near point adjustment

  3. same for both the cases

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The magnifying power of an optical instrument like a microscope is maximum when the final image is formed at the least distance of distinct vision (near point). For a simple microscope, the magnification at the near point is M = 1 + D/f, whereas for normal adjustment (image at infinity), it is M = D/f.

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