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Angular width of central maxima in the F...

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

`6000 Å`

B

` 4200 Å `

C

`3000 Å `

D

`1800 Å `

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The correct Answer is:
B
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