The invention of telescope time also causes him to discover the properties of light. Newton has started experiments on light by closing the room until dark, the light seeping in through the small glass rods and then using a triangle, called Prism (Prism), light through the Prism glass rods. It appears that the effect of light passing through a Prism has 7 colors include: purple, red, blue, green, yellow, Indigo-t, respectively. Newton has repeated several times the same every time. Later, Newton has more experiments by using a Prism, one more light through the prism of the results, it appears that saengklai is the same as white came through in the first place. From the results of the trial can be concluded that Newton.
The Sun consists of 7 colors of blue, purple and red-light blue green yellow vajra show and red, respectively, and when all 7 combinations of light, it becomes a white light.