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Wave Optics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
If numerical aperture of a microscope is increased, then its
  • A
    resolving power remains constant.
  • B
    resolving power becomes zero.
  • ✓
    limit of resolution is decreased.
  • D
    limit of resolution is increased.
✓

Answer

Correct option: C.
limit of resolution is decreased.
(c) : Since limit of resolution of a microscope is given by, $d=\frac{1.22 \lambda}{2 \mu \sin \alpha}=\frac{1.22 \lambda}{2 NA }$
$\therefore$ As numerical aperture increase, the limit of resolution is decreases.

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