Diffraction
It refracts the light, basically taking the light beam apart and spreading it out to see all the visible colors in the light spectrum. Water does the same thing and that is how rainbows are made.
The (strong) tendency of light to travel in a straight line.
wavelength and diameter of aperture.
A concentrated light is called: A Lazer.
dispersion
It is called Visible light Spectrum.
a spreading cone of light
The spreading of something more widely.The action of spreading the light from a light source evenly so as to reduce glare and harsh shadows.
Beam spreading is when the sun's rays (or angles) spread out because the earth is in it's revolution and rotation. However this is the definition of beam spreading relating light and the amount of light received to earth, not relevant to another meaning. So basically beam spreading is when the sun's light spreads on earth.
Its a spectrum
The spreading of a desert is called desertification.
Spreading light in the life of others
The random spreading of one fluid through another is called DIFFUSION
scattering
It is called "desertification".
A fast-spreading, often fatal disease is called a plague ~Mz.Ryah Gresham Elementary