Expressions for the dependence of interference fringes contrast in a Fresnel electron bi-prism on source width or virtual sources distance are stated in the first part of the paper. For given working conditions the influence of the virtual sources distance on interference fringes contrast at different source widths is given. First disappearance of the contrast at a constant source width is experimentally verified.
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Drahoš et al. (1964) studied this question.
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