Question

What would happen to the distances between bright spots intensity maxima on the screen if the spacing between the slits is doubled?

Answer 1

If the spacing between the slits is doubled, this happens to the distances between bright spots intensity maxima on the screen:

1. The bandwidth is the distance between two bright fringes.

2. The formula for bandwidth is $\beta =\lambda D/d$, here $\lambda$ is the length of the light's wavelength, and the distance between the source and the screen is denoted by $D$ the distance between the two slits is denoted by $d$.

3. As a result, if the slit spacing is doubled, the distance between the two bright spots will be reduced to half.