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Spectroscope

A spectroscope is a device which measures the spectrum of light. Early spectroscopes were simply a prism with graduations marking wavelengths. Modern spectroscopes generally use a diffraction grating, a movable slit and some kind of photodetector[?], all automated and controlled by a computer.

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... have a median income of $38,036 versus $31,696 for females. The per capita income for the town is $29,939. 5.5% of the population and 2.2% of families are below th ...