Hi, this video Part 1 with animation , is a quick initial introduction to the Fresnel Biprism, to give a feel for what it looks like . For more details of working principle, please see next video- Light-Fresnel Biprism- Part 2 , there is a detailed explanation of the Refraction followed by Interference , resulting in Dark and Bright Bands. (please also visit www.physicsmodels.in) Thanks.

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Best explanation on the internet, Please watch: "Ray diagrams Physics - Optical Instruments-Astronomical Telescope"
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