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What is the effect on the interference fringes in a Young’s double-slit experiment if the width of the source slit is increased?
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What is the effect on the interference fringes in a Young’s double-slit experiment if the width of the source slit is increased?

Answer

In case if the source slit width increases fringe pattern gets less and less sharp. The interference pattern may disappears if the source slit is wide enough.
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