does the rainbow spectrum work like the eye,
turning things upsidedown, ie rainbow entering flipped one way,
and going out the other way w/ violet on top, like sky rainbow?
bc thought red was always on the bottom

Refraction is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another. This bending by refraction makes it possible for us to have lenses, magnifying glasses, prisms and rainbows. Even our eyes depend upon this bending of light.
🕯

im trying to grasp it…

CLEVELAND, Aug. 24, 2020 — An effort led by Federico Capasso of Harvard University and Giuseppe Strangi of Case Western Reserve University is using liquid crystals to improve the reconfigurability of metalenses. This advancement brings the viability of metalenses for commercial use closer to reality.

The researchers harnessed nanoscale forces to infiltrate liquid crystals between the microscopic pillars that allow metalenses to focus light. This allowed them to shape and diffract light in new ways, “tuning” the focus power, Strangi said.