Archive of posts with tag “geometrical optics”

Nov 9, 2022
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 $\frac rf$ .
/physics #geometrical optics #from zhihu