A pair of narrow, parallel slits separated by 0.270 mm is illuminated by the gre

Question

A pair of narrow, parallel slits separated by 0.270 mm is illuminated by the green component from amercury vapor lamp ( = 546.1 nm). The interferencepattern is observed on a screen 1.25 mfrom the plane of the parallel slits. (a) Calculate the distance from the centralmaximum to the first bright region on either side of the centralmaximum.
1 mm

(b) Calculate the distance between the first and second dark bandsin the interference pattern.
2 mm (a) Calculate the distance from the centralmaximum to the first bright region on either side of the centralmaximum.
1 mm

(b) Calculate the distance between the first and second dark bandsin the interference pattern.
2 mm

Explanation / Answer

given slit seperation d = 0.270*10-3m wavelength = 546.1*10-9m screen to slits distance L = 1.25m a) distance from central maxima to first bright fringeis        y = L/d            = ----------- b) distance between first & second dark fringe is             y = ym+1 - ym                  = L/d                   = ------------ Hope this may help you .

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