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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 if close to :

1. 2.0 × 10 –7 rad
2. 4.5 × 10 –7 rad
3. 1.5 × 10 –7 rad
4. 3.0 × 10 –7 rad

Correct answer: 3.0 × 10 –7 rad

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