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1. The diagram below shows a schematic diagram of the Young two-slit confluence experiment. The point sources A and B are in phase and emit monochromatic light of wavelength 2 = 600 nm. The distance between the sources is d=0.15 mm and the horseshoe is at a distance of L = 1 m from the sources as shown in the figure. a y d E Пс D Bº L Consider that the following approximations hold: distance L is much larger than distance d (L»d), the distance d between slits is much larger than the wavelength 1 (d>>) and the angle 6 is very small so that siine tane. In the horseshoe we observe bright and dark confluence fringes. a) Use the appropriate figure to explain what type of fringe (bright or dark) we observe at point C. (6) If a second-order bright fringe (m= 2) is formed at point P, what is the distance y? C) How many dark fringes are there between positions C and P and how far is each from C? d) If the point sources had a phase difference n explain what kind of fringe would be observed at C. Notes: The phase difference Ap between two waves is related to the path difference Ar by the relationship below σχέση Δφ - 214r = a