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A single slit of width 'a' is illuminated by a monochromatic light of wavelength 600 nm. The value of ‘a’ for which first minimum appears at θ = 30° on the screen will be :

1. 1.2 μ m
2. 3 μ m
3. 1.8 μ m
4. 0.6 μ m

Correct answer: 1.2 μ m

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