According to Abbe,in the formula for the resolving power of a microscope,the numerical aperture is represented by:

  • A
    $\frac{2 \mu \sin \alpha}{\lambda}$
  • B
    $\frac{2 \sin \alpha}{\mu \lambda}$
  • C
    $\mu \sin \alpha$
  • D
    $\frac{\lambda}{2 \mu \sin \alpha}$

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