Hartmann test

The Hartmann test is an optical method used to evaluate the shape and quality of a mirror or lens. It works by projecting a grid of light spots onto the mirror and then analyzing how these spots are reflected back. If the mirror is perfectly shaped, the spots will appear in their expected positions. Any deviations indicate surface irregularities or distortions. This test helps engineers identify and correct imperfections in telescopes or other precision optical components, ensuring they focus light accurately and produce clear images.