Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of

Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will be
A. `3500 Å`
B. `4200 Å`
C. `4700 Å`
D. `6000 Å`

Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. W

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