In Young's double slit experiment, if one of the slit is closed fully, what will be visible on the screen?

A slit-shaped bright spot

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A YDSE interference pattern

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A diffraction pattern

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Nothing will be visible

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Solution

The correct option is C
A diffraction pattern

If one of the slits is closed then YDSE interference fringes are not formed on the screen, so you might be tempted to say 'A slit-shaped bright spot' will be all that you can see on the screen, but no, think about what you just learnt, a fringe pattern is observed due to diffraction from the single slit that is open.

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