In Young's double slit experiment,two slits are separated by 3 mm distance and illuminated by ligth of wavelength 480 nm.The screen is at 2 m from the plane of the slits.Calculate the separtion between the 8th bright finge and the 3rd dark fringe obsrved with respect to the central brigth fringe.

Explanation

`d = 3mm = 3 xx 10^(-3) m`
`lambda = 5900 xx 10^(-8) cm = 59 xx 10^(-6) m`
D = 3 m
`beta`= ?
`beta = (lambdaD)/d = (59 xx 10^(-8) xx 3)/(3 xx 10^(-3))`
`= 59 xx 10^(-2)mm`
`beta = 0.59 mm`