“Hmmm #Evanescentwaves sound interesting 🧐
In optics and acoustics, evanescent waves are formed when waves traveling in a medium undergo total internal reflection at its boundary because they strike it at an angle greater than the critical angle”
Lead me to #TalbotEffect “The Talbot effect is a diffraction effect first observed in 1836 by Henry Fox Talbot.When a plane wave is incident upon a periodic diffraction grating, the image of the grating is repeated at regular distances away from the grating plane”