DR GARY SETTLES / SCIENCE PHOTO LIBRARY DR GARY SETTLES / SCIENCE PHOTO LIBRARY
Candle flame, interferometer image. Close-up of a candle flame and its hot-air plume, imaged with an optical instrument known as a white-light shearing interferometer. The colour fringes in the candle plume and background are similar to those seen in an oil-slick on water, and are an optical phenomenon known as Newton's rings.
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