If you move the source slit closer to the double slit in Young's experiment, what will be effect on the fringes?

Give the expression for the fringe widh in Young's experiments.

Yellow light of wavelength 6000Å produces fringes of width 0.8 mm in Young's double slit experiment. What will be the fringe width of the light source if it is replaced by another monochromic source of wavelength 7500Å and sepearation between the slits is doubled?

Draw the graph of intensity distribution in Young's double-slit experiment.

(Attempt any nine of the following questions) What are coherent sources? In a Young's double slit experiment the intensity of light at a point on the screen where path difference lambda is K units. Find the intensity at a point where the path difference is lambda/ 3 .