66.From ray diagram show the (1) image formation by concave lens for the object at focus. (2) image formation by concave lens for the virtual object at focus
Lenses - StickMan Physics
Concave lens – Object at different distances from the lens
How to Draw a Ray Diagram for a Concave Lens | Physics | Study.com
Lesson Explainer: Drawing Ray Diagrams for Concave Lenses | Nagwa