https://wordnik.com/words/concave%20lens
concave lens - definition and meaning
concave lens: a lens such that a parallel beam of light passing through it is caused to diverge or spread out
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https://www.universetoday.com/articles/concave-lens
Concave Lens - Universe Today
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https://www.made-in-china.com/Instruments-Meters-Catalog/browse-Concave-Lens-35100400000002.html
Concave Lens - China plano concave cylindrical lens, spherical lens Manufacturers/Suppliers on...
View reliable Concave Lens manufacturers on Made-in-China.com. This category presents plano concave cylindrical lens, spherical lens, from China Concave Lens...
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