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- https://phys.libretexts.org/Bookshelves/Optics/Geometric_Optics_(Tatum)/04%3A_Optical_Aberrations/4.06%3A_DistortionThe magnification of an image is image distance divided by object distance, and image distance is different off-axis than on-axis, so the image magnification varies with distance from the axis. If thi...The magnification of an image is image distance divided by object distance, and image distance is different off-axis than on-axis, so the image magnification varies with distance from the axis. If this distortion is quite small, it may not be noticed in ordinary pictorial photography, but if one is using a photograph for precise positional measurements (for example, in astrometry) it is necessary to correct for the distortion.
- 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/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/zz%3A_Back_Matter/10%3A_13.1%3A_Appendix_J-_Physics_Formulas_(Wevers)/1.06%3A_OpticsOptical components and the behaviour and properties of optical waves
- https://phys.libretexts.org/Learning_Objects/A_Physics_Formulary/Physics/06%3A_OpticsOptical components and the behaviour and properties of optical waves
- https://phys.libretexts.org/Bookshelves/Optics/BSc_Optics_(Konijnenberg_Adam_and_Urbach)/02%3A_Geometrical_Optics/2.08%3A_AberrationsIf instead one retains the first two terms of the Taylor series of the sine, the errors in the image can be quantified by five monochromatic aberrations, the so-called primary or Seidel aberrations. T...If instead one retains the first two terms of the Taylor series of the sine, the errors in the image can be quantified by five monochromatic aberrations, the so-called primary or Seidel aberrations. The best known is spherical aberration, which is caused by the fact that for a convergent spherical lens, the rays that makes a large angle with the optical axis are focused closer to the lens than the paraxial rays (see Figure \(\PageIndex{1}\)).
