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Q.

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

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a

Fringe are affected

b

Diffraction pattern is spread more

c

Central fringe is white and all are coloured

d

Fringes will not form.

answer is C.

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Detailed Solution

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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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