อาจารย์มหาวิทยาลัยสอนหน้ากระดานดำ

A realistic photo taken on an iPhone 16 of a university classroom. [A female professor in smart-casual attire] is teaching [quantum physics]. Behind her, a large green chalkboard is filled with detailed, crisp chalk explanations, mathematical equations, and clear instructional diagrams. Bright overhead classroom lighting, candid eye-level shot, empty student desks in the foreground. No students present.