In most spectrometers, the divergent light is then collimated by a concave mirror and directed onto a grating. ... The grating then disperses the spectral components of the light at slightly varying angles, which is then focused by a second concave mirror and imaged onto the detector.

How does a diffraction grating spectrometer work?

A diffraction grating is an optical element, which separates (disperses) polychromatic light into its constituent wavelengths (colors). The polychromatic light incident on the grating is dispersed so that each wavelength is reflected from the grating at a slightly different angle.

What is the basic principle of spectrometer experiment using grating?

Basic Function of Spectrometers

The slit vignettes the light as it enters the spectrometer. Then, in most spectrometers, the divergent light is collimated by a concave mirror and directed onto a grating. Following this, the grating disperses the spectral components of the light at slightly varying angles.