Question
Define resolving power of a compound microscope. How does the resolving power of a compound microscope change when.
  1. refractive index of the medium between the object and objective lens increases?
  2. wavelength of the radiation used is increased?

Answer

R.P. of microscope is reciprocal of the minimum separation of two near points, seen as distinct.
or
R.P. of microscope is reciprocal of the smallest distance between two point object, which are just resolved by the microscope.
  1. increases, (with increase of $\mu$)
  2. decreases, (with increase of $\lambda$).

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