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Introduction to YDSE

In Young's do...

Question

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

A

A bright slit will be observed, no interference pattern will exist

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B

The bright fringes will become more bright

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C

The bright fringes will become fainter

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D

None of the above

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Solution

The correct option is C
The bright fringes will become fainter

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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