To analyze the light output from a lamp source you will need to aim the spectroscope at the source and be able to see light from the source entering through the slit. An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument. Similarly to how the aperture size of a camera affects the brightness and resolution of its photos, the width of the spectrometer entrance slit determines both its ability to measure in low-light conditions and the maximum spectral resolution. Spectroscopic measurements are used in many different applications, such as color measurement. (Choice of mirror material/coating can affect light throughput efficiency of the. By reading that spectrum, scientists can identify what a substance is made of, how hot it is, and how fast it's moving.
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