Bubbles on water from washing-up liquid

Bubbles on water from washing-up liquid

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Caption: Layer of bubbles on water produced by washing up liquid. The colours, produced just before the bubbles burst, are due to interference between light rays reflected from the front & back of the thin film of water making the bubble. The colours depend on the thickness of the film; black where the film is very thin indeed, silver colours are produced by a film about 70 nanometers thick, gold about 100 nanometers thick, green by films about 150 nanometers thick & red as the film gets thicker.

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Keywords: bubble, interference pattern, light, optics, physics

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