Question

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A sodium vapour discharge lamp acted as the light source in the photos A pure sodium vapour discharge essentially produxes light at two closely spaced wavelengths in the yellow region of the visible spectrum at wavelengths of 589.6 and 589.0 For your work you should presume that only the light of one wavelength, 589.3 amis Theoretical Problems 1) Figure 3 is a schematic diagram showing the lower surface of a circular glass lens esting on a glass plate foglav plate Figure If the radius of curvature of the lens surface is large, there will be a thin film of air of Varying thickness between the lens surface and the plate. As shown at a radius from the system as the thickness of the film is r. Also, the radius of curvature, R of the glass lens surface, is large compared to the film thickness, Using the right angled triangle rule we can say that the thickness of the film, is related to Randby (R- - - -21R + 2- (2R - 21R - and if > then (22- 1 2R. SO

Answer 1

+ D D 2 R 8 R Die na D = 4 HAR = ndR Ku=snar Auwer