Henry Augustus Rowland pioneered diffraction grating. This is when a periodic structure with an optical component is used to split light into several beams in separate directions.

X-ray diffraction pictures. A scattering of X-ray beams off the atoms of a crystalline substance to try and deduce the form of the substance.

PS That was Wilkins.

Dimmer switch broke??

Diffraction is the bending of waves around an obstacle under specific circumstances.

"Diffraction" does.