Angular width of central maximum in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by another wavelengths, the angular width decreases by 30%. Calculate the wavelength of this light. The same decreases in angular width of central maximum is obtained when the original appertus is immersed in a liquid. find the refractive index of the liquid.

Angular width of central maximum in the Fraunhofer diffraction pattern

1.	Angular width of central maximum in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by another wavelengths, the angular width decreases by 30%. Calculate the wavelength of this light. The same decreases in angular width of central maximum is obtained when the original appertus is immersed in a liquid. find the refractive index of the liquid.
Answer» SOLUTION :`4200 Å, mu=1.43`

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