Changes

[[Image:lighterstill.jpg]]

[[Image:lighterstill.jpg]]

[[Image:PrismAndLight.jpg|thumb|300px|A beam of white light (entering upwards from the right) is dispersed into its constituent colors by its passage through a [[triangular prism (optics)|prism]].  The fainter beam of white light exiting to the upper right has been reflected (without dispersion) off the first surface of the prism.]]

[[Image:PrismAndLight.jpg|left|thumb|300px|A beam of white light (entering upwards from the right) is dispersed into its constituent colors by its passage through a [[triangular prism (optics)|prism]].  The fainter beam of white light exiting to the upper right has been reflected (without dispersion) off the first surface of the prism.]]