PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY PHILIPPE PSAILA / SCIENCE PHOTO LIBRARY
Soap film showing light interference patterns. The pattern and colours on the surface of the film are caused by light reflecting from both the front and back of the film. The thickness of the film varies across the surface, affecting the wavelength of incident white light. Certain wavelengths of white light are extinguished, producing the colour interference pattern seen here.
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