Angular width of central maximum in the Fraunhoffer's diffraction p...

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Angular width of central maximum in the Fraunhoffer's diffraction pattern is measured. Slit is illuminated by the light of another wavelength, angular width decreases by \( 30 \% \). Wavelength of light used is If the previous wavelength was \( 6000 \mathrm{~A} \)
(a) \( 3500 \AA \)
(b) \( 4200 \AA \)
(c) \( 4700 \AA \)
(d) \( 6000 \AA \)
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