Light

Light is a very complex phenomenon (A phenomenon greek: from the Greek word ‘phenomenon’, from the verb ‘phanein’, to show, shine, appear, to be manifest (or manifest itself), plural Phenomena, is any observable occurrence. Phenomena are often, but not always, understood as ‘appearances’ or experiences’.), But in many situations its behavior can be understood with a simple model based on rays and wave fronts. A ray is a thin beam of light that travels in a straight line. A wave front is the line (not necessarily straight) or surface connecting all the light that left a source at the same time. For a source like the Sun, rays radiate out in all directions; the wave fronts are spheres centered on the Sun. If the source is a long way away, the wave fronts can be treated as parallel lines.

Light as said has seven colors.

Violet
Indigo
Blue
Green
Yellow
Orange
Red

Violet has the least wavelength. Red has the highest wavelength.