25: Vision and Optical Instruments Last updated Nov 5, 2020 Save as PDF 24.4: Mirrors 25.1: The Human Eye Page ID16185 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy25.1: The Human EyeThe human eye is an organ that reacts with light and allows light perception, color vision and depth perception.25.2: Other Optical InstrumentsA magnifying glass is a convex lens that lets the observer see a larger image of the object being observed.