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Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star.

1. 152.5 × 10 –9 radian
2. 457.5 × 10 –9 radian
3. 610 ×10 –9 radian
4. 305 ×10 –9 radian

Correct answer: 305 ×10 –9 radian

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