Refer to your text or a web resource to compare its explanation of the double-slit interference with your observations. Determine how the superposition of waves can give rise to either constructive or destructive interference. Show that the small angle approximation allows you to substitute y/D for sin in your calculation of fringe spacing. What variables affect the spacing of the bright fringes in the double-slit pattern? Write theoretical expressions used to determine the separation between dark and bright interferences of the double-slit experiment.