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Fresnel biprism Theory PART 1
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=3Oj2KLLBD30
Fresnel's Biprism • Fresnel's Biprism consist of two points ABC and A'BC having acute angles at A and A' and placed base to base with each other as shown in figure. In actual practice, it is constructed as a single prism having obtuse angle of 179° at B and acute angles at 30° each at A and A'. The prism was first designed by Fresnel and that is why it is so called. • The Fresnel's biprism can be used to obtain two coherent sources as follows. The biprism is placed in an upright fitted on an optical bench, so that its refracting edge B is parallel to a line source of light S. • #learningscience • #fresnelbiprism • #theory
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