In Froaunhoper diffraction due to a narrow slit a screen is placed 2m away from the lens to obtain the pattern. If the slit with is o.2mm and the first minima lie 5mm on either side of the cental maxima, find the wavelength of light?
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Explanation:given fringe width=5mm. Distance between slit and screen=D= 2m. d= width size=0.2mm also fringe
width=wavelength×D÷d therefore wavelength is 500nm
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