Image of the Week: Tea-Glass Optics The curved surface of a glass of tea and the liquid within refract and focus sunlight into a bright, concentrated spot, which diffuses into an amber-tinted conical shape. The glass also acts as a prism, creating a miniature dispersion effect along the light pattern’s edges that results in a boomerang-like rainbow. —Vahid Abbasian, Washington University in St. Louis, St. Louis, MO, USA *Link in Bio #glass #prism #light #rainbow