Explain how two coherent sources are obtained using a biprism?

Explain how two coherent sources are obtained using a biprism?

• A prism of a very large angle is placed with its refractive edge facing a monochromatic source of light, S.
• Light incident on face L is refracted to appear to come from a point S1 and that incident on Q appears to come from S2 due to refraction.
• The two sources are coherent since they originate from the same source S leading to interference where they superpose.

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