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- 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/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/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/16%3A_Reflections_and_Refraction_of_Waves/16.02%3A_Optics/16.2.07%3A_Double_Convex_LensesAt least one of the faces is a part of a sphere; a convex lens is thicker at the center than the edges, and a concave lens is thicker at the edges than the center. If the object is placed inside F (be...At least one of the faces is a part of a sphere; a convex lens is thicker at the center than the edges, and a concave lens is thicker at the edges than the center. If the object is placed inside F (between F and the lens), the image will be on the same side of the lens as the object and it will be virtual, upright, and enlarged. For convex lenses, when the object is placed inside F, the image will be on the same side of the lens as the object and it will be virtual, upright, and enlarged.
- https://phys.libretexts.org/Courses/Coalinga_College/Physical_Science_for_Educators_(CID%3A_PHYS_14)/16%3A_Reflections_and_Refraction_of_Waves/16.02%3A_Optics/16.2.06%3A_Convex_MirrorsIn convex mirrors, the reflecting surface is on the outside of the sphere, making the center of curvature and the focal point on the opposite side of the mirror from the object. For convex mirrors, th...In convex mirrors, the reflecting surface is on the outside of the sphere, making the center of curvature and the focal point on the opposite side of the mirror from the object. For convex mirrors, the reflecting surface is on the outside of the sphere, placing the center of curvature and the focal point on the opposite side of the mirror from the object. Since the focal point is on the opposite side of the mirror from the object, the focal length is assigned a negative number.
