What is the difference between the fringe pattern produced by Lloyd’s single mirror & Fresnel bi-prism
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Biprism also known as Fresnel biprism is a triangular prism with vertex angle of nearly 180° and it is used to obtain images of a single source in observing the interference of light.
Lloyd's mirror is used to produce two-source interference patterns, similar to the pattern produced by laser light passing through two slits
The central fringe obtained from Biprism is bright because the waves from both the coherent sources reach the central point in the same phase. On the other hand the central fringe obtained with a Lloyd's mirror is dark because the reflection of light from the denser mirror
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