Nearly a decade after getting waves of light to bend backward, physicists have done the same with electrons. Electrons coursing through a sheet of carbon atoms exhibited negative refraction, bending ...

Based on: Refraction, and How to Refract. Including Sections on Optics, Retinoscopy, the Fitting of Spectacles and Eye Glasses, etc. By James Thorington, A.M., M.D., Professor of Diseases of the Eye ...

There are a couple of different ways that cloud inversions can produce optical effects, explains one of our readers ...