A beam of white light (entering upwards from the right) is dispersed into its constituent colors by its passage through a prism. The fainter beam of white light exiting to the upper right has been reflected (without dispersion) off the first surface of the prism.
Animation of the dispersion of light as it travels through a triangular prism
Extremely high resolution spectrum of the Sun showing thousands of elemental absorption lines (fraunhofer lines)
A cloud illuminated by sunlight
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