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In Young's double slit experiment the slits are separated by 0.28mm and the screen is placed at a distance of 1.4m away from the slits. The distance between the central bright fringe and the fifth dark fringe is measured to be 1.35cm. Calculate the wavelength of the light used. Also find the fridge width if the screen is moved towards the slits by 0.4m, for the same experimental set up. |
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Answer» Solution :Fringe width `BETA=(lambdaD)/d` Given The DISTANCE of the fifth dark fringe from the central bright fringe =1.35 cm `beta=(m-1/2)(Dlambda)/d` WAVELENGTHOF light USED `lambda=600 xx 10^(-9)`m ,m=5 Taking distance between the slits and the screen as 1m `rArr beta=(600xx10^(-9)xx9xx1)/(2xx1.35xx10^(-2)xx0.28xx10^(-3))` Calculation of fringe width = `7.142xx10^(-3)` m |
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