Abstract:The well--known experiment of Young about interferences by means of a Fresnel biprism to obtain the double--slit is usually made using quasi--monochromatic sources: a sodium spectral lamp, a laser, etc. Besides, a monochromatic source is also assumed in order to develop the theoretical explanation of the experiment. Then, some experimental details are lost, as the dependence of the fringe--to--fringe spacing on the wavelength. Moreover, a much more dangerous negative effect is originated, since some students c… Show more
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