Describe Young's double slit experiment.

Explanation

Young has kept slit S on screen A and two parallel slits having `SS_(1)` = `SS_(2)` on screen B parallel to the slit S and screen A and B placed parallel.
Now placing screen C at far from screen B so that straight line fringes are produced by the super imposing of the cylindrical wavefronts emanating from the slits `S_(1)S_(2)`.

The intensity distribution curve for interference of Young.s double slit experiment is in figure.

From the graph, it can be said that all interference fringes are the same width and the same intensity.
Points on which the estructive interference occur have zero intensity.
The distance between two successive bright fringes or two successive dark fringes is same and the intensity of fringe does not depend on the order of fringes.