Learn about the law of reflection through ray diagrams and plane mirrors, and the key facts of refraction with a practical experiment using ray tracing.

A ray diagram shows how light travels, including what happens when it reaches a surface. In a ray diagram, ... The diagram below shows reflection in a plane mirror. Back to top.

Ray Diagrams. Reflection of light by spherical mirrors. Sign Convention. Concave mirror when rays are paraxial. Convex mirror when rays are paraxial. Formation of Focal Plane.