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Angular width of the central maximum in the Fraunhofer diffraction for  = 6000 Å is  0 . When the same slit is illuminated by another monochromatic light, the angular width decreases by 30%. The wavelength of this light is :

1. 1800 Å
2. 4200 Å
3. 6000 Å
4. 420 Å

Correct answer: 4200 Å

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