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  4. If a monochromatic light source is replaced by a white light source in Young's interference experiment. Then, the colour of the fringe adjacent to central maxima will be:

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Q. If a monochromatic light source is replaced by a white light source in Young's interference experiment. Then, the colour of the fringe adjacent to central maxima will be:

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Solution:

The colour of fringe adjacent to central maxima will be of violet colour but farthest will be of red colour. As fringe width $\left(\beta = \frac{\lambda D}{d}\right)$ will be minimum for violet colour.