diffractions

Diffractions is the plural of diffraction, a physics term for the bending or spreading of waves—typically light or sound—when they encounter an obstacle or pass through an opening.

The phenomenon explains why you can hear around corners or why light creates patterns when passing through narrow slits.

In optics, diffraction patterns are the interference bands produced when light waves interact after bending.

The diffractions visible through the grating confirmed the wave nature of light.