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What is the effect on Fresnel's biprism experiment when the use of white light is made?

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Fringe are affected

Central fringe is white and all are coloured

Diffraction pattern is spread more

Fringes will not form.

answer is C.

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Detailed Solution

With white light, the rays reaching the centre has zero path difference. So we get white fringe at the centre and coloured near the central fringe.

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