The slits in a Young’s double slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is I 0 . If one of the slits is closed, the intensity at this point will be

The slits in a Young’s double slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is I₀. If one of the slits is closed, the intensity at this point will be

We know the maximum amplitude is

Here,

Now, if one slit is closed,

Hence,

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