LYCOS RETRIEVER 
Lens: Shape
built 621 days ago
If you have ever looked at the lens of a magnifying glass, you know that it is thick in the middle and tapers down to nothing at the edges. In other words, it is shaped like a lentil, which is where the word lens comes from. It would not be very easy to make a big magnifying glass lens for your RV because it would be thick, heavy and hard to mount.
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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 ... gives its name to a geometric figure.
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The ciliary muscle helps to change the shape of the lens. This changing of lens shape is called accommodation. If you click on ciliary you can see the anatomical structures involved and how the lens shape change takes place.
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