The graph shows the light intensity on a distant screen for Young's Experiment (double slit interference)[br][list][*]The [color=#6aa84f]green[/color] line shows the effect of diffraction through each slit. [br][/*][*]The [color=#7F6000]brown[/color] line shows the interference pattern (slits of zero width) [br][/*][*]The [color=#ff0000]red[/color] line shows the actual intensity for slits of given width and separation.[/*][*]You can use the sliders to change the distance between slits (d), the width of each slit (w) and the wavelength of light ([math]\lambda[/math])[/*][*]The checkboxes allow you to choose which graphs to display.[br][/*][/list]