 Anything that gives off light.  Sun  Stars  Fire  Candle  Electric Light Bulb

 A light ray that bounces off a reflective surface at the exact angle at which it contacted the surface.

 The bending of light as it passes from one substance to another.

 Light passes directly through an object without changing.  Glass  Transparency  Air  water

 An object that lets some light through, they scatter and disperse light.  Wax paper  Tissue

 An object that does not allow light to pass through. Instead they absorb some of the light that is cast on them.  Wood  Metal  Paper  Book