A-LevelPhysicsSuperpositionFeb/Mar 2018Paper 5 Q215 Marks
A student is investigating monochromatic light passing through a double slit. Bright and dark fringes are produced on a screen as shown in [Figure 2.1]. The distance w between 10 bright fringes is measured. The fringe spacing P between neighbouring bright fringes is then determined. The experiment is repeated for light of different wavelengths λ. It is suggested that the fringe spacing P and the wavelength λ are related by the equation P / D = λ / S where D is the distance from the double slit to the screen and s is the slit separation.
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