Question

in youngs double slit experiment what happens happens to the interfernce pattern if
1. width of the slit is doubled
2. seperations between the slits is increased
3. screen is moved away from the plane of slits

Answer 1

The fringe width is given by w = λD/d (1) In this case, as we increase 'D' the fringe width will increase as well (from the relation) and its intensity decrease. (2) As 'd' increases fringe width decreases and intensity increases. (3) The fringe width would be halved by using the above formula.