In the arrangement shown, S is a point source of monochromatic light. S1 and S2 are two slits located sym- metrically with respect to the source with separation between them` d_(1)`. Parallel to this slit plane there are two more slits (S3 and S4) at separation` d_(2)`. These slits are also symmetrically located with respect to S. A screen is at a distance `L_(2)` from this slit plane. How does the intensity on the screen change with y and `d_(1)`?

In YDSE, the source placed symmetrically with respect to the slit is now moved parallel to the plane of the slits it is closer to the upper slit, as shown then

In YDSE, the source placed symmetrically with respect to the slit is now moved parallel to the plane of the slits it is closer to the upper slit, as shown then

In YDSE, the source placed symmetrically with respect to the slit is now moved parallel to the plane of the slits it is closer to the upper slit, as shown then

Monochromatic light from a narrow slit illuminates two parallel slits producing an interference pattern on a screen. The separation between the two slits is now doubled and the distance between the screen and the slits is reduced to half. The fringe width

Monochromatic light from a narrow slit illuminates two parallel slits producing an interference pattern on a screen. The separation between the two slits is now doubled and the distance between the screen and the slits is reduced to half. The fringe width

In the set up shown in figure, the two slits S_1 and S_2 are not equidistant from the slit S. The central fringe at O is then

In the set up shown in figure, the two slits S_1 and S_2 are not equidistant from the slit S. The central fringe at O is then

In the arrangement shown in the figure, S1 and S2 are two parallel slits at a separation d. There is a screen at a distance D (gtgtd) from the slits. Two point sources A1 and A2 have been placed symmetrically with respect to the slits at a large distance with ltltA_(1)OO_(1)=ltltA_(2)OO_(1)=Deltatheta . The sources are monochromatic giving out light of wavelength l but they are incoherent. Write the intensity of light at a point P on the screen as a function of y. Take I_(0) to be maximum intensity on the screen when one of the two sources (A1 and A2) is switched on. Assume y to be small.