Lenses are used in cameras, telescopes, binoculars, ... In a ray diagram, a converging lens is drawn as a vertical line with outward facing arrows to indicate the shape of the lens.

X-Ray Imaging Camera Lens Persuaded To Join Micro Four Thirds Camera. ... From the diagram on page 34, there is a thick phosphor coated glass in front of a 100mm f1.5 xr-helidon, ...