[[1]] are an optical instrument which belong to the class of spectrometers and are used to obtain and record an astronomical spectrum.

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Concept: Spectrographs are an optical instrument which belong to the class of spectrometers and are used to obtain and record an astronomical spectrum. A spectrograph is an optical device that collects and stores an astronomical spectrum. They are a type of spectrometer. It breaks down the light coming from the item under evaluation into its individual wavelengths, allowing for recording and later analysis. Now, there are several methods for achieving light dispersion, such as diffraction gratings, prisms, etc.
Now, various astronomical objects create various spectra, which might be of the emission or absorption sorts. There will be certain spikes or spectral lines in the astronomical spectrum that may be utilised by astronomers to identify a star or planet's element, temperature, matter density, and magnetic field.
These spectral lines can provide us with information regarding velocities and redshifts through precise measurement. Different emission or absorption line shapes can be used to determine an object's pressure, density, and spin. We can learn about the physical changes in the star or seen object if the strength of these lines increases or decreases. Astronomers may examine the interstellar medium, which is not empty but rather contains dust or gaseous particles, thanks to radiation from objects between the stars.
Hence, the solution is spectrographs.

[[1]] are an optical instrument which belong to the class of spectrometers and are used to obtain and record an astronomical spectrum.

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