2. Light always travel in a STRAIGHT line.

3. A luminous object radiates light in ALL directions.

4. Light Ray: a line and arrow representing the direction and straight-line path of light. Geometric optics: the use of light rays to determine the path of light when it strikes an object. Incident light: light emitted from a source that strikes an object

5. Transparent object allows light to pass easily. Ex: clear glass Translucent object allows only some light to pass through. Ex: frosted glass. Opaque object does NOT allow light to pass through. Light instead is absorbed or reflected..

6. Image: reproduction of an object through use of light. Mirror: any polished surface that reflects an image. Reflection: the bouncing back of light from any surface.

7. Mirrors are made of a piece of glass with a back strip of thin, reflective film made out of silver or aluminum.

8. Incident Ray – the incoming ray that strikes a surface. Reflected Ray – the ray that bounces off a reflective surface

9. Normal line – the perpendicular line (90 o ) to a mirror surface. Angle of incidence ( <i ) – angle between incident ray and the normal Angle of reflection ( <r ) – angle between reflected ray and the normal

10. Online resources for reflection of flat mirrors activities: http://faculty.sdmiramar.edu/gbochicchio /reflectionlab.pdf http://www.curriki.org/xwiki/bin/view/ Coll_mackzoore/Reflection?viewer=print