Difference between revisions of Diopters
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===Thin Lens Equation=== | ===Thin Lens Equation=== | ||
The focal length of a lens is given by the lensmaker's equation. By assuming the lens is much thinner than the radius of curvature, therefore assuming lens thickness is zero, we get the | The focal length of a lens is given by the lensmaker's equation. By assuming the lens is much thinner than the radius of curvature, therefore assuming lens thickness is zero, we get a simplified version of the lensmaker's equation. We can do some further derivation, we arrive at the thin-lens equation:<ref>see derivations at https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Book%3A_University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/02%3A_Geometric_Optics_and_Image_Formation/2.05%3A_Thin_Lenses</ref> | ||
<math>\frac{1}{d_o}+\frac{1}{d_i}=\frac{1}{f}</math> | <math>\frac{1}{d_o}+\frac{1}{d_i}=\frac{1}{f}</math> | ||