![Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com](https://study.com/cimages/multimages/16/camerafocus.jpg)
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
![Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius](https://www.rp-photonics.com/img/focal_length.png)
Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
![MathType on Twitter: "The focal length for a positive converging lens in air is the distance from the lens to the point where the incident light beam is focused. It can be MathType on Twitter: "The focal length for a positive converging lens in air is the distance from the lens to the point where the incident light beam is focused. It can be](https://pbs.twimg.com/media/E5L_rhPWEAQWxZp.jpg:large)
MathType on Twitter: "The focal length for a positive converging lens in air is the distance from the lens to the point where the incident light beam is focused. It can be
![Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm - YouTube Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm - YouTube](https://i.ytimg.com/vi/0GXwBHln8OE/maxresdefault.jpg)