The diameter of the objective lens of a telescope is $250\, cm$. For light of wavelength $600\, nm$ coming from a distant object, the limit of resolution of the telescope is close to:
- A$1.5 \times 10^{-7}\, rad$
- B$2.0 \times 10^{-7}\, rad$
- C$3.0 \times 10^{-7}\, rad$
- D$4.5 \times 10^{-7}\, rad$
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