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The word lens comes from the Latin name of the lentil , because a double-convex lens is lentil-shaped. The genus of the lentil plant is Lens , and the most commonly eaten species is Lens culinaris . The lentil plant also gives its name to a geometric figure .
The lens is also known as the aquula (Latin, a little stream , dim. of aqua , water ) or crystalline lens . In humans, the refractive power of the lens in its natural environment is approximately 18 dioptres , roughly one-third of the eye's total power.
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