$A$ person is observing a bacteria through a compound microscope. For better analysis and to improve the resolving power,he should:

  • A
    increase the wavelength of light.
  • B
    increase the refractive index of the medium between the object and objective lens.
  • C
    decrease the focal length of the eye-piece.
  • D
    decrease the diameter of the objective lens.

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The diameter of the pupil of the human eye is about $2 \, mm$. The human eye is most sensitive to the wavelength of $555 \, nm$. The limit of resolution of the human eye is ....... $min$.

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The resolving power of a microscope depends upon:

What minimum separation between two objects a human eye would be able to resolve, if the eye pupil diameter is $2 \,mm$ and the two objects are $20 \,m$ away from the eye (in $\,mm$)?
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