It’s all to do with the raindrops, says one reader, with them needing to be relatively uniform in size and well separated for ...

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 ...

Cover title: How to become a refractionist. siris_sil_323279 ...