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Tiny lens that uses light trickery to detect gas created in Germany
The researchers describe the microlens’s ability to change its refractive behavior as ... we show that concave as well as convex lens structures can be obtained at high precision by remelting ...
BBC4y
Common defects of the eye and how they can be overcome
These two defects are treated with spectacle lenses, which refract (bend ... Short-sightedness can be corrected by placing a concave lens in front of the eye, as shown in the diagrams below.
BBC2y
Convex and concave lenses
In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.