(i) What is the effect on the interference fringes to a Young's double slit experiment when
(a) the separation between the two slits is decreased?
(b) the width of the source slit is increased?
(c) the monochromatic source is replaced by a source of white light? Justify your answer in each case.
(ii) The intensity at the central maxima in Young's double slit experimental set up is `I_0`. Show that the intensity at a point where the path difference is `lambda//3` , is `I_0//4`