Twyman-Green Interferometer

The Twyman-Green Interferometer is an optical device used to measure the quality of optical surfaces, like lenses or mirrors. It works by splitting a beam of light into two paths: one reflects off the surface being tested, while the other serves as a reference. When the light beams are recombined, they create an interference pattern of light and dark fringes. This pattern reveals imperfections or deviations in the surface's shape. The device is essential in fields like optics and engineering, helping ensure high-quality lenses and mirrors for cameras, telescopes, and other optical instruments.