This general similarity to the behavior of light crossing through convex and concave lenses is consistent with the idea that foraging ants, like light rays, use time-reducing paths.

A concave eyepiece then magnified the tiny image for the viewer to see. Galileo's first telescope offered limited magnification and a narrow field of view.

Plano concave lens bend parallel input rays so they diverge from one another on the output side of the lens and hence have a negative focal length. The spherical aberration of the plano concave lenses ...

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 ...

Learn about and revise lenses, magnifying lenses, images and ray diagrams with this GCSE Bitesize Physics revision guide for OCR Gateway.

X-ray light can already be focussed even more intensely with other lenses, but the prototype test impressively demonstrates that the new lens design functions as was intended.