An experimental setup is described which uses a prismatic dye cuvette and a dispersion glass prism. The two prisms are oriented so as to ensure wavelength-dependent deflection in two perpendicular planes. The dispersion of the solvent material was subtracted by using an immersion cuvette filled with the solvent liquid of the dye solution. The setup displays the contribution of the dye material to the refractive index of the solution as a function of the wavelength. The setup is simple, inexpensive, does not use toxic or hazardous materials or high temperature ovens, and thus can be a very useful means to demonstrate the effect of anomalous dispersion at different levels of education.
In this paper a new approach is presented to explain the formation of Talbot's bands by using the model of tilted pulse fronts. Numerical calculations of this model are presented. Another interpretation of Talbot's original paper is also given and explained. Simple experiments, suitable for students' laboratory practice, have been used to carefully study the dependence of the visibility of the bands on different properties of the plate: thickness, refractive index, dispersion. Photos of Talbot's bands are also presented.
A new approach is introduced for the explanation of the formation of Talbot's bands by using the model of tilted pulse fronts. Numerical computations of this model are also given. An other interpretation of Talbot's origiiial publication is also presented and explained. Simple experiments have been used to examine cautiously the dependence of the visibility of Talbot's bands on various properties of the plate: thickness, refractive index, dispersion. An experiment has been carried out to check the other interpretation, too.
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