TON KINSBERGEN / SCIENCE PHOTO LIBRARY TON KINSBERGEN / SCIENCE PHOTO LIBRARY
Hologram of an aeroplane wing. Holography uses laser beams to record the dimensions of an object as a set of interference patterns. Shining light on the pattern recreates a holographic image of the object. This technique is used in security markings and other applications. Interference is an effect observed when waves overlap and either constructively reinforce or destructively cancel each other, producing the alternating light and dark patterns seen.
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