It is a Scientist's last name. Augustin-Jean Fresnel, born 1788, died 1827
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yes,because in fresnel biprism the fringe width can be increased so that the dark and bright fringes can be seen clearly by naked eyes..but there is no such problem in fresnel biprism.. in young's double slit experiment, the pattern is the superposition of interference and diffraction. but in fresnel biprism it is purely interference pattern.
Fresnel Bi Prism is to find wavelength of monochromatic light sorce and to determine the thickness thin glass sheet placed on sorce Written by Ajay kumar
To make two coherent source for interference .Biprism make two sources.
A fresnel biprism is a triangular right prism with a highly obtuse angle in cross-section. The obtuse angle is near 180 degrees. The typical use of such a prism is to produce two coherent "virtual" light sources from one real point source. These virtual sources can be used to demonstrate interference.
Two coherent sourses are produced with the bi-prism by the phenomenon of refraction through the refracting surfaces.