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The tyndall effect occurs when you shine a light through an object and small particles get in the way of the light reflecting them away, thus making it possible to see the light when you shine a laser pointer through aerosol spray, the light hits the particles in the air and reflects them back to you.
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Scattering of a beam of light by a medium contaning small suspended particles is known as tyndall effect.
smoke or dust in a room which makes visible a light beam entering window .
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