1. The problem statement, all variables and given/known data A soap bubble is floating in the air. The wall of the bubble has an index of refraction of n = 1.33. It is observed that red and violet light are reflected from the surface of the bubble, but no green light is reflected. Compute the minimum thickness of the bubble. 2. Relevant equations v=fλ c=3x10^8 3. The attempt at a solution I'm pretty much just confused on where to start. I'm assuming it has something to do with the color destructively interfering with the soap bubbles, so that only some of the color reflects. Do I start by picking the smallest possible wavelength that includes both red and blue cones, and then assume that the speed of light is slower due to the soap material, THEN assume that the soap bubble has to be one wavelength long?