Angular width of central maxima in the Fraunhoffer 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

Angular width of central maxima in the Fraunhoffer diffraction pattern

1.	Angular width of central maxima in the Fraunhoffer 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.	\[4200\,\,{AA}\]
C.	Remains unchanged
D.	\[1800\,\,{AA}\]
Answer» C. Remains unchanged

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Angular width of central maxima in the Fraunhoffer 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

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