BBC2 年
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.
BBC2 年
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.
PBS3 年
Two Types of Telescopes
The first spectacles, designed to correct farsightedness, bore glass magnifiers that ... he discovered that plano-convex and plano-concave lenses worked best—that is, lenses with a plane on ...
Optics10 天
Optical Lens Plano Concave Lens Manufacturer
A plano-concave lens is a lens with one side being flat and the other side being concave. It is characterized by being thin in the center and thick at the edges, and can make parallel light rays ...
来自MSN9 个月
Tiny lens that uses light trickery to detect gas created in Germany
Using 3D-printed fused silica templates, we show that concave as well as convex lens structures can be obtained at high precision by remelting the glass without trading-off on material quality.