In a Young’s double-slit arrangement, monochromatic light of wavelength 600nm falls on two very narrow slits separated by 0.40mm. The interference pattern is observed on a screen 1.2m away from the slits.
(a) Calculate the fringe width on the screen.
(b) A point P on the screen is located 2.0mm above the central bright fringe. Determine the path difference between the two waves arriving at P and state whether P lies on a bright or a dark fringe.
(c) How far from the central bright fringe will the ninth bright fringe be observed?