This round convex glass mirror measures 3 inches (75 mm) in diameter with a focal length of 100 mm and an approximate thickness of 2.8 mm. The mirror is designed for physics and educational applications. Convex mirrors diverge reflected light, producing virtual, upright, and diminished images. This makes the mirror useful for demonstrations of curved mirror optics, including ray diagrams and image characteristics. Due to the educational design, minor surface imperfections may be present but do not affect physical function.