Optics explained 2: Focus or Focal point
In this video you will find:
Explanation what a focus or focal point is.
Explanation how to determine the focus point with a converging lens.
Explanation how to determine the focus point with a diverging lens.
Two example questions.
The PhysicsPlace is an educational YouTube channel where high school and college physics is explained. Every video also has a few example questions which you can use to check your knowledge!