Question

in a biprism experiment, light of wavelength 5200 A is used to get an interference pattern on the screen.the fringe width changes by 1.3mm when the screen is moved towards biprisim by 50cm.find the distance between two virtual images of the slit........

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Answer 1

When two waves of light travel through the medium arrived at a point of medium, the resultant displacement at any instant is the vector sum of displacement produced by them. When two waves meeting at a point are in phase resultant displacement is added and when two waves meeting at a point are out of phase resultant displacement is subtracted.