How Does a Spectrograph Preserve Information Across One System?

What must each optical stage receive and hand off before starlight becomes a raw detector frame?

Trace six optical handoffs from the telescope focal plane to raw detector counts, then follow one failure downstream.

A coherent optical bench carries starlight through a focal plane, slit, collimator, diffraction grating, camera optics, and rectangular detector. — Vastward artistic reconstruction of a representative slit spectrograph. The interactive diagram supplies the localized labels and evidence boundary.

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