Thicker in the center than on the edges; they cause parallel light rays emanating from an object to converge onto the same point.

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Size: 4000px × 2250px
Photo credit: © QAI Publishing / Alamy / Afripics
License: Licensed
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Keywords: :, center, color, converge, converging, edges, emanating, illustration, lenses, light, object, optics, parallel, physics, point., rays, science, thicker