![convex lens concave lens how to determine focal length ray diagrams image properties real virtual inverted size correction of eye defects causes of long-sight short-sight igcse/gcse 9-1 Physics revision notes AQA Edexcel convex lens concave lens how to determine focal length ray diagrams image properties real virtual inverted size correction of eye defects causes of long-sight short-sight igcse/gcse 9-1 Physics revision notes AQA Edexcel](https://www.docbrown.info/page20/page20images/LensDiag02.gif)
convex lens concave lens how to determine focal length ray diagrams image properties real virtual inverted size correction of eye defects causes of long-sight short-sight igcse/gcse 9-1 Physics revision notes AQA Edexcel
![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/focal_length.jpg)
Focal Length Formula & Examples | How to Calculate Focal Length - Video & Lesson Transcript | Study.com
![a Explain with the help of a diagram, why the concave lens is also called a diverging lens. b Define the principal focus of a concave lens. a Explain with the help of a diagram, why the concave lens is also called a diverging lens. b Define the principal focus of a concave lens.](https://search-static.byjusweb.com/question-images/byjus/files/d1a/1191471a34e9fad78608a8cf4861d359.jpg)
a Explain with the help of a diagram, why the concave lens is also called a diverging lens. b Define the principal focus of a concave lens.
![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/previews/focal_length.png)