A romantic heroine is often backlit to create a halo effect on her hair.
refract the light to give the halo effect.
The clouds contain ice crystals which refract the light to give the halo effect.
Particles of dust and dirt cause light waves to scatter, causing a halo-effect, and making glare seem worse.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.