Soap Films

The beautiful colours that you can see on soap bubbles are a result of the interference of light waves off the front and back surfaces of the soap films membrane. The illustration below shows incident light waves on the film with reflections from the top and bottom surfaces. These reflected light waves interfere with one another to produce particular colours depending on the thickness of the film at that point. The thickness of the film changes continually due to laminar and turbulent currents of water within the lipid bilayer interior aswell as draining of the film.