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In a young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength λ = 500 nm is incident on the slits. The total number of bright fringes that are observed in the angular range – 30º ≤ θ ≤ 30º is :

1. 640
2. 641
3. 320
4. 321

Correct answer: 641

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