The limit of resolution of an oil immersion objective microscope of numerical aperture $0.8$ for light of wavelength $0.6 \mu m$ is
- A$\frac{1.5}{8} \mu m$
- B$\frac{3}{8} \mu m$
- C$\frac{5}{8} \mu m$
- D$\frac{7}{8} \mu m$
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