Light refraction with biconcave lens. Animation showing parallel beams of light (left) diverging as they pass through a biconcave 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 concave shape of the lens, the light beams are refracted away from the angle of incidence as they leave the lens, causing them to diverge. The more severe the concave shape, the more the beams diverge.
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