Educational audiobook for childrem to learn about light. Light comes from light sources that can be natural or artificial. An example of a natural light source is the sun and an example of an artificial light source is a lighthouse. There are materials that behave differently with light: transparent, translucent and opaque. Transparent materials allow light to pass through them. Translucent materials are those that allow some light to pass through. Opaque materials are those that don't allow any light to pass through.