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An incandescent light-bulb viewed through a transmissive diffraction grating.

Diffraction Grating

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A diffraction grating is a type of optical device that is used to separate light into its different wavelengths.
An inexpensive 532nm laser pointer.

Understanding Laser Pointers

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Laser pointers are handheld devices that emit a narrow, focused beam of light, which is the result of a process called stimulated emission. They can be a valuable tool in…