Lenses are used to focus light. But on larger scales, conventional lenses can become too massive. The Fresnel lens allows for a lens of large aperture and short focal length useful for efficient magnification and concentration on any scale. Physicist Augustin Jean Fresnel designed its clever surface which is divided into concentric ridges. By layering these ridges to be on the same curvature, it becomes a lightweight alternative for most projects.
These lenses are not unlike a reverse telescope. Instead of bringing in light from far away, these lenses are capable of concentrating light to a narrow point to reach great distances.
Used in lighthouses to bring ships to safety through their concentrated beam of light. They have been called "the invention that saved a million ships".
Dimensions: 3.5" x 2"
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Sacha gave this item 5 stars
Cool stocking stuffer for my FIL!
Sam gave this item 5 stars
This little lens is perfect for quick, satisfying glances closer at the curios and specimens I’ve collected on my desk. Sturdy enough and still flexible, it’s a little larger than a standard index card and is worth it— especially while it’s still on sale.
i like it good zoom
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