Q117 / 150 · MHT CET 2023 (10 May Shift 1) · Physics

A person is observing a bacteria through a compound microscope. For better observation and to improve its resolving power he should

  • A
    increase the wavelength of light.
  • Correct answer
    B
    increase the refractive index of the medium between the object and objective léns.
  • C
    decrease the focal length of the eyepiece.
  • D
    decrease the diameter of the objective lens.

Solution

Resolving Power $\mathrm{R}=\frac{\text { N.A }}{0.61 \lambda}$ $\text { N.A }=2 \mathrm{n} \sin \alpha$ $\therefore \quad$ By increasing the refractive index of the medium between the subject and the objective lens, the resolving power can be increased.

Hence, the correct answer is option: 'B'.

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