![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)
Calculate the focal length of a convex lens which produces a virtual image at a distance of 50 cm - YouTube
![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/16/2diagram_mirror6688182548421281944.png)
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
![Derivation of Equivalent Focal Length of Combination of two lens separated by distance #kamaldheerya - YouTube Derivation of Equivalent Focal Length of Combination of two lens separated by distance #kamaldheerya - YouTube](https://i.ytimg.com/vi/JTOSQLL93pY/maxresdefault.jpg)
Derivation of Equivalent Focal Length of Combination of two lens separated by distance #kamaldheerya - YouTube
![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
![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)