Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The... VIDEO
Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength \( 6000 \AA \). When the slit is illuminated by light of another wavelength, the angular width decreases by \( 30 \% \). The wavelength of this light will be
(A) \( 6000 \AA \)
(B) \( 3000 \AA \)
(C) \( 4200 \AA \)
(D) \( 1800 \AA \)
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