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Fringe Width in YDSE

In a two slit...

Question

In a two slit experiment with white light, a white fringe is observed on a screen kept behind the slits. When the screen is moved away by $0.05 m$ , this white fringe

A

Does not move at all

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B

Gets displaced from its earlier position

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C

Becomes coloured

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D

Disappear

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Solution

The correct option is A Does not move at all
In two slit interference with white light, all colours having same phase converge at central maxima, thus we see while fringe. On moving the suits away, the central maxima does not change its position.

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