A Spectrograph Is a Scientific Instrument That

A spectrograph is a scientific instrument that

A) measures the effectiveness of the specular reflection of mirrors.
B) spreads out light from a source into its component colors, or spectrum.
C) measures the transparency of different types of glass at different colors by using glass prisms.
D) focuses all the colors of light from a star at one point so that the total intensity of the star can be measured, for photometry.

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