Light and optics

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[edit] Geometric optics

Light and optics are all around you. There are several different kinds of lenses and mirrors including concave Concave lenses and convex Convex lenses.

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One of the central formulae in geometric optics is the thin-lens equation (also known as the lens-maker's equation). This states that for a lens (or mirror) with focal length f,

\frac{1}{f} = \frac{1}{s} + \frac{1}{s'}

where s is the distance between the lens and the object, and s' is the distance from the lens to the image of the object.

Also a general equation for magnification is as follows:

m = \frac{y'}{y} = \frac{-s'}{s}

where y is the object height and y' is the image height.

You can find a good description of lenses in w:Lens (optics)

[edit] External links

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