In Young's double-slit experiment, the point source is placed slightly off the central axis shown in Fig. 2.45.
a. Find the nature and order of the interference at point P.
b. Find the nature and order of the interference at point. O.

In a Young's double slit experiment, the central point on the screen is

In Young's double slit experiment the point source is placed slightly off the central axis as shown in figure. The plane of slits (S_(1), S_(2)) and screen are separated by a distance of 2m. The separation between the slits is 10 mm. The position of the slit above the axis is 1mm. if the wavelength lambda = 4000 Å in the above arrangement The thickness of the film in the above case is