The Czerny-Turner configuration is a specific arrangement of optics in spectrographs. There are other configurations, but Czerny-Turner is the most common. A majority of StellarNet spectrometers use the Czerny-Turner configuration. The diagram below shows the configuration:
Light from point A enters the spectrograph through the entrance slit at B. A concave mirror, C, collimates the light and reflects it onto the grating, D. The light diffracts and reflects off of concave mirror, E. This focuses the light toward the detector, F.
