define tyndall effect?
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Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room, which makes visible a light beam entering a window. The effect is named for the 19th-century British physicist John Tyndall, who first studied it extensively.
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When a narrow beam of a light penetrates and enters in a room through a small hole in the ceiling, Tyndall effect can be noticed, because the particles of dust and smoke scattered the light.
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