Physics for students

In Young's Double Slit experiment following changes are observed if we change the parameters in following way:

DOUBLE SLIT ARRANGEMENT

INTERFERENCE AND FRINGE FORMATION

1. If wavelength of the incident light is increased the fringe spacing will be increased as it is directly proportional to the wavelength of the incident light but the contrast between the bright and dark fringes will not be affected.

2. If the double slit separation is increased the fringe spacing will be reduced as it is inversely proportional to the double slit separation but the contrast between the bright and dark fringes will not be affected.

3. If the distance from the double slits to the screen is increased the fringe spacing will be increased as it is directly proportional to distance between the double slit and screen but the contrast between the bright and dark fringes will be reduced as the intensity of the bright fringes will be reduced.