In a YDSE, the central bright fringe can be identified :

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As it has greater intensity than the other bright fringes

As it is wider than the other bright fringes

As it is narrower than the other bright fringes

By using white light instead of single wave-length light

answer is D.

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Detailed Solution

In a monochromatic light is used , all the brights seem to be identical and hence central bright cannot be identified. If white light is used, the central bright will be white and all the remaining brights are coloured and formed separately for different coloures. Now the central bright can be identified.

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