Search Demonstrations

search in
Demonstrations by Category:

Scattering of Light (Sunset) (N 4)

Keyword: Refraction

Demonstration Description:
A beam of white light is directed through a transparent vessel and projected on a screen. The vessel contains a mixture of water and sodium thiosulfate. Dilute sulfuric acid is added to the mixture. Colloidal sulfur begins to form and the beam passing through the liquid starts to look blue. As the number and size of the scattering particles increases, the transmitted light changes color from a bright white to yellow to orange, and then to red. Eventually even red light is no longer transmitted. It can also be shown that the light through the container becomes increasingly polarized in the process

Similar Demonstrations