external “Physicists Close In on ‘Perfect’ Optical Lens” —Quanta Magazine

In 1967, the Russian scientist Victor Veselago wondered: What if [the refractive index], and therefore that angle, was negative? His minus sign completely transformed the equations of optics, yielding fantastic new solutions in which light pulled instead of pushed when striking a surface, and stretched when it would normally compress into a shockwave. Best of all, while regular curved lenses can only form images of objects located at the “focal point,” negative refraction is achieved with a flat lens that can form images of large regions of space.

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