Archive of posts with tag “geometrical optics”
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The image of a circular object through a thin lens
The image of a circle with radius $r$ and centered at $C\left(-2f,0\right)$ through a thin lens at $x=0$ with focal length $f$ and centered at $O\left(0,0\right)$ is a conic section with the focus being $\left(2f,0\right)$, the directrix being line $x=f$, and the eccentricity being $\frac rf$.
- Categories: physics
- Tags: geometrical optics, from zhihu