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The three Angles of fresnel biprism are​

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answer :-

A Fresnel Biprism is a thin double prism PLACED base to base and have very SMALL REFRACTING angle ( 0.5o). This is equivalent to a single prism with one of its angle NEARLY 179° and other two of 0.5 o each. The INTERFERENCE is observed by the division of wave front.



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