Refraction of light through concave and convex lenses video - YouTube
Molecular Expressions: Science, Optics, and You: Light and Color - Introduction to Lenses
GCSE PHYSICS - What is the Ray Diagram for a Concave Lens? - What is a Virtual Image? - What is an Upright Image? - GCSE SCIENCE.
Concave - Focuses the lines of light towards a center Convex - Spreads the lines of light Straight - Reflects almost exact | Curved mirror, Reflection, Concave
Concave lens – Principal focal point (two of them)
reflection - Does reflected light from a concave mirror pass through a single point? - Physics Stack Exchange