![Fundamentals of geometrical optics - Focus and principal planes of focal optical systems (with focus) Fundamentals of geometrical optics - Focus and principal planes of focal optical systems (with focus)](http://www.optique-ingenieur.org/en/courses/OPI_ang_M03_C01/res/fig32.jpg)
Fundamentals of geometrical optics - Focus and principal planes of focal optical systems (with focus)
![Principal points and principal planes, explained by RP Photonics Encyclopedia; paraxial optics, front and back focal length, Gaussian optics Principal points and principal planes, explained by RP Photonics Encyclopedia; paraxial optics, front and back focal length, Gaussian optics](https://www.rp-photonics.com/previews/principal_points_and_principal_planes.png)
Principal points and principal planes, explained by RP Photonics Encyclopedia; paraxial optics, front and back focal length, Gaussian optics
![The camera optics with thin convex lens. P1 and P2 are the principal... | Download Scientific Diagram The camera optics with thin convex lens. P1 and P2 are the principal... | Download Scientific Diagram](https://www.researchgate.net/profile/Hong-Jeong-2/publication/232634361/figure/fig5/AS:667776842739730@1536221814824/The-camera-optics-with-thin-convex-lens-P1-and-P2-are-the-principal-planes-Q1-and-Q2.jpg)
The camera optics with thin convex lens. P1 and P2 are the principal... | Download Scientific Diagram
![Fundamentals of geometrical optics - Focus and principal planes of focal optical systems (with focus) Fundamentals of geometrical optics - Focus and principal planes of focal optical systems (with focus)](http://www.optique-ingenieur.org/en/courses/OPI_ang_M03_C01/res/fig31.jpg)
Fundamentals of geometrical optics - Focus and principal planes of focal optical systems (with focus)
![Principal points and principal planes, explained by RP Photonics Encyclopedia; paraxial optics, front and back focal length, Gaussian optics Principal points and principal planes, explained by RP Photonics Encyclopedia; paraxial optics, front and back focal length, Gaussian optics](https://www.rp-photonics.com/img/back_focus.png)