The contrast in the fringes in an interference pattern depends on

fringe width

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wavelength

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intensity ratio of the sources

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distance between the slits

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Solution

The correct option is D intensity ratio of the sources
The contrast in the fringes in an interference pattern depends on intensity ratio of the sources.
It would be good when the ratio of intensities is equal to one, so that intensity of bright fringes is maximum, while those of dark fringes is minimum i.e., zero. Otherwise it is not so good.

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