Scientists have come up with scenarios through which the first eye-like structure, a light-sensitive pigmented spot on the skin, could have gone through changes and complexities to form the human ...

It is refraction ... the normal. Light can be focused so that the rays appear to meet at a single point. Focusing light is important for getting clear images in our eye or in photographs, because ...

NASA’s Perseverance rover has detected the first aurora at Mars that's visible to the human eye, good news for future astronauts who can savor the view on the red planet.

On their own expedition, the researchers used lasers to precisely deliver tiny doses of light to select cone cells in the human eye. First, they mapped a portion of the retina to identify each ...

Refraction close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ray changes direction when refracted by a lens.