Question

Light passes through a pair of very thin parallel slits. The resulting interference pattern is viewed far from the slits at various angles θ relative to the centerline coming outward from the midpoint between the slits. The central bright fringe is at θ=0∘. If the central bright fringe has intensity I0, what is the intensity of the next bright fringe on either side of it?

Answer 1

Intensity of the next bright fringe will remain same.

Step-by-step explanation:

The question is based on Young's double slit experiment, since its about bright fringe, the interference here is constructive.

Young's condition for constructive interference is given by:

dsin
`\theta = n\lambda`

where,

d = slits distance from eachother or width of the slits

`\lambda` = wavelength

n = interferance order

Also, we know that in Young's experiment, the fringe intensity is given by:

`I' = 4Icos^(2)\phi`

where,

`\phi` = phase difference

Therefore, in absence of phase difference i.e.,
`\phi = 0`, the intensity of the next bright fringe will not change and it will remain same.