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A youngs double slit experiment is conducted with slit seperation 10mm, where the screen is 2m away from the slits,if wavelength of light is used 6000A^0 if the wavelength is increased by1000A^0, and placed the whole apparatus in water of refractive index 4/3,the new fringe width in mm is
Frimge width is given as:B = kD/d where k is the wavelength.Now given,B = 6000*2*10^-10/10.Again apply formulae in water but the new wavelength would become:k = 6000*(4/3)/1000
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