D is for Diffract

See also: Diffraction

Narrower slits spread the light. Closer slits spread the bright bands.

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Photo of a diffraction demonstration
Science
Diffract is the verb form of the science concept, diffraction. Waves diffract when they pass through a narrow opening.

The word comes from a Latin word meaning "to break apart." Diffraction is different from refraction.
Micah Sittig / CC BY-SA