Light falls on a pair of slits 19.0 m apart and 80.0 cmfrom the screen. The firs

Question

Light falls on a pair of slits 19.0 m apart and 80.0 cmfrom the screen. The first-order bright line is 1.90 cm from thecentral bright line. What is the wavelength of the light? *What exactly is the equation I have to use for this? I'ma bit confused... Thanks for helping!! Light falls on a pair of slits 19.0 m apart and 80.0 cmfrom the screen. The first-order bright line is 1.90 cm from thecentral bright line. What is the wavelength of the light? *What exactly is the equation I have to use for this? I'ma bit confused... Thanks for helping!!

Explanation / Answer

the distance of the central bright fringe from thecentral maximum                   Xn = nL / d                    L= distacne from the screen  to the slits                   d = distanec between the slits                    n = order of maxima from the above relation we can solve for wavelength               for the first bright fringe n = 1                          = Xd / L ,. plugging in the known values we can solve for the aboveequation .                                                   

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