Soap Bubbles in terms of optics etc. Help needed :) 1. The problem statement, all variables and given/known data The opening of a metal cylinder is dipped in soapy water so that a soap film forms. The cylinder is then turned so it is horizontal (and the soap film is vertical). What happens to the thickness of the soap film? White light is shined through the cylinder, and you view the light that reflects off of the film. What do you see? How is the thickness of the soap film related to what you see reflected off of the film? 2. Relevant equations Well this is more of a conceptual one. 3. The attempt at a solution I'm a bit confused at this one. For the second one, do you see a spectrum of colors (the rainbow)? I'm not sure about the thickness of the soap etc. If the soap is at its thickest it becomes black.. does it progressively become darker? Not sure again. Thanks to anyone who can help me on this!