Light refraction with biconvex lens. Animation showing parallel beams of light (left) converging as they pass through a biconvex lens shown varying in size at left. As light passes through the lens it slows down and is refracted due to the greater density of the lens material. Due to the biconvex shape of the lens, the light beams are refracted towards the angle of incidence as they leave the lens, causing them to converge. The more severe the convex shape, the more the beams converge.
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