Thin Film Interference (part 2)
Close up of a thin film of soapy water that is vertically suspended across a 19 cm diameter plastic ring and illuminated with white light. Gravity pulls down on the film to make it much thinner in the top section of the ring than in the bottom section. Light reflecting from the front surface of the thin film is able to interfere with light reflecting off of the back, resulting in different reflected colors from different film thicknesses. For example, where the film thickness causes destructive interference br, br,
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