Glossary
Key word
Transparent
Translucent
Opaque
Normal
Incident ray
Reflection ray
Angle of incidence
Angle of reflection
Ray diagram
Specular reflection
Diffuse reflection
Refraction
Definition
Materials that allow to pass through
freely. They do not produce shadows
Materials that allow some light to pass
through. They produce weak shadows
Materials that do not allow light to pass
through. They produce dark shadows
An imaginary line at 90OC to the surface
Light ray moving towards a surface
Light ray leaving a surface
Angle between the normal and the
incident ray
Angle between the normal and the
reflected ray
Diagram the represents the direction and
angle of light rays
When light is reflected from a surface in a
single direction
When light reflected from a surface is
scattered in different directions
When a wave changes speed and
sometimes direction when travelling
through a more or less dense medium