Glossary |
Lense Equation |
updated: 2021-08-23 |
In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the radii of curvature of the lens surfaces. Lenses whose thickness is not negligible are sometimes called thick lenses.
If the distances from the object to the lens and from the lens to the image are S1 and S2 respectively, for a lens of negligible thickness (thin lens), in air, the distances are related by the thin lens formula.
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If 
, this is the normal case in astronomy (using a telescope to observe celestial objects).
see: Lens - Wikipedia
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