Copied Biprism Interference Apparatus
Biprism Interference Apparatus
United Scientific Supplies, PFB001, Precision Fresnel Biprism Interference ApparatusFeatures:Perform Fresnel's Biprism Experiment on a 1m optical benchPrecision optics allow fringe position measurements to 1/100mmEasy alignment and adjustment of the two virtual light sourcesFresnel's Biprism Experiment is the fundamental example of common path interference by division of wavefront. Light from a slit passes through side-by-side prisms with very shallow angles to separate it into two almost parallel beams. When these beams are brought to overlapping by a convex lens, they interact as if they originated from two virtual sources side by side and generate equally-spaced fringes. The original version of the experiment by Fresnel is difficult to perform because it requires precise adjustment of the slit and prisms, a dark room, and a large amount of space to separate the fringes for easy viewing.
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