Different substances in the brain absorb and refract light by different amounts.
From the newscientist.com
Indeed, most compliments given Shultz refract an implied criticism of of Haig.
From the time.com
Metamaterials are able to refract light to the left, or at a negative angle.
From the sciencedaily.com
The artificial light would surely refract and make visibility very tricky.
From the telegraph.co.uk
These internal waves continue to flow eastward and to refract around coastal features.
From the en.wikipedia.org
In the air, Snell's Law dictates that sounds refract back into the atmosphere after 10 km.
From the scienceblogs.com
These new devices refract at the same speed or even faster than eyes do.
From the bostonherald.com
The glass appears to refract and reflect light naturally, but it does not really exist.
From the newscientist.com
We refract their behavior through the prism of our own because that's what we know best.
From the lightbox.time.com
More examples
Subject to refraction; "refract a light beam"
Determine the refracting power of (a lens)
(refraction) the change in direction of a propagating wave (light or sound) when passing from one medium to another
(refraction) deflection: the amount by which a propagating wave is bent
(Refraction (metallurgy)) In metallurgy, refraction is a property of metals that indicates their ability to withstand heat. Metals with a high degree of refraction are referred to as refractory. These metals derive their high melting points from their strong intermolecular forces. ...
To change direction as a result of entering a different medium; (Optics) To cause (light) to change direction as a result of entering a different medium
(refracting) (ri-FRAKT-ing): bending or changing direction
(Refraction) test for the eyes' ability to focus light rays properly on the retina at distances and close by.
(Refraction) The degree of nearsightedness, farsightedness, or astigmatism is determined during this test. A series of lenses are used and adjusted before your eyes to determine the best correction.