Convex lens – object at `F`
An object at `F` is an object at one principal focal length away from the convex lens.
We use the two most important rules of ray diagrams
- From the object, pass a parallel line through the principal focal point.
- From the object, pass a ray line through the centre of the convex lens.
The refracted rays travel parallel with each other. You cannot see an image by looking or using a sheet of paper.
At `F`, no image
