Afterward, is the central spot bright, dark, or in between?
a) the central spot is dark.
b) the central spot is bright.
c) the central spot is in between bright and dark.



Answer :

Afterward, the rings due to light that is transmitted through the glass plate and you will find that the central spot is bright.

The Newton’s rings experiment shows interference rings between a flat surface and a spherical surface sitting on top of it. The interference path is the gap in between the sphere and the plane. And sometimes that gap is not visible and has zero gap.

The center is where the curve of the sphere is touching the plane. so there is zero path difference there, as there is zero gap, you’ll have constructive interference (light). So the central spot is bright.

To know about sphere here

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