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- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_2040%3A_General_Physics_III/05%3A_Vision_and_Optical_Instruments/5.1%3A_The_Human_EyeThe human eye is an organ that reacts with light and allows light perception, color vision and depth perception.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/25%3A_Vision_and_Optical_Instruments/25.2%3A_Other_Optical_InstrumentsA magnifying glass is a convex lens that lets the observer see a larger image of the object being observed.
- https://phys.libretexts.org/Courses/Grossmont_College/ASTR_110%3A_Astronomy_(Fitzgerald)/03%3A_Radiation_and_Spectra/3.07%3A_TelescopesA telescope collects the faint light from astronomical sources and brings it to a focus. Light is then directed to a detector, where a permanent record is made. The light-gathering power of a telescop...A telescope collects the faint light from astronomical sources and brings it to a focus. Light is then directed to a detector, where a permanent record is made. The light-gathering power of a telescope is determined by the diameter of its aperture, or opening—that is, by the area of its largest or primary lens or mirror. The primary optical element in a telescope is either a convex lens (in a refracting telescope) or a concave mirror (in a reflector) that brings the light to a focus.
- https://phys.libretexts.org/Courses/Prince_Georges_Community_College/PHY_2040%3A_General_Physics_III/05%3A_Vision_and_Optical_Instruments/5.2%3A_Other_Optical_InstrumentsA magnifying glass is a convex lens that lets the observer see a larger image of the object being observed.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/06%3A_Astronomical_Instruments/6.02%3A_TelescopesA telescope collects the faint light from astronomical sources and brings it to a focus. Light is then directed to a detector, where a permanent record is made. The light-gathering power of a telescop...A telescope collects the faint light from astronomical sources and brings it to a focus. Light is then directed to a detector, where a permanent record is made. The light-gathering power of a telescope is determined by the diameter of its aperture, or opening—that is, by the area of its largest or primary lens or mirror. The primary optical element in a telescope is either a convex lens (in a refracting telescope) or a concave mirror (in a reflector) that brings the light to a focus.
- https://phys.libretexts.org/Bookshelves/University_Physics/Physics_(Boundless)/25%3A_Vision_and_Optical_Instruments/25.1%3A_The_Human_EyeThe human eye is an organ that reacts with light and allows light perception, color vision and depth perception.
- https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/06%3A_Astronomical_Instruments/6.01%3A_TelescopesA telescope collects the faint light from astronomical sources and brings it to a focus. Light is then directed to a detector, where a permanent record is made. The light-gathering power of a telescop...A telescope collects the faint light from astronomical sources and brings it to a focus. Light is then directed to a detector, where a permanent record is made. The light-gathering power of a telescope is determined by the diameter of its aperture, or opening—that is, by the area of its largest or primary lens or mirror. The primary optical element in a telescope is either a convex lens (in a refracting telescope) or a concave mirror (in a reflector) that brings the light to a focus.
