What is white light ?
emitted by the Sun is white light.
Some lamps may also generate white light.
Décomposition of light
can be decomposed by a prims or diffraction grating.
- A prism is a block made of glass or another transparent material
having a triangular base.
- A diffraction grating consists of fine parallel striated slits,
White light passing through a prism gives a serie of colored lights
from violet to red and with all shades of blue, green, yellow and
orange that can be observed on a white screen placed behind the prism.
All these colored lights come from the white light in which they are
mixed. The prism only separates colored lights but it doesn't create
White light is
composed of a mixture
of all the colored lights that
This set of
colored lights is the spectrum
of visible light