Difference between revisions of Optics related math
m →Infinity: minor rewording, to paint a picture of the object moving towards the lens continuously, rather than just jumping straight from infinity to the focus. |
Some minor details about the lens diagram that I thought were interesting. Need some more lens pictures to show different configurations. |
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== | ==Lenses== | ||
[[File:Lens3.svg|right]] | |||
The image shows a typical converging lens. The three rays drawn each have an interesting characteristic: | |||
* the top ray enters the lens parallel with the optic axis, and so passes through the focal point on the other side | |||
* the middle ray passes through the optical centre of the lens, and is undeviated | |||
* the bottom ray passes through the focal point on the incident side, and so emerges parallel to the optic axis | |||
===The thin lens equation=== | |||
<math>\frac{1}{f} = (\frac{1}{s}) + (\frac{1}{s'})</math> | <math>\frac{1}{f} = (\frac{1}{s}) + (\frac{1}{s'})</math> | ||
where | where | ||