2-12-08 class

Wavefronts and Rays
-use a ray to indicate the direction of motion of a wave front
-rays of a circular wavefront are radial lines
-rays on a plane wavefront are parellel lines
-use to track the direction of waves

Reflection
-a wave striking a surface at an angle
-latin "a bending back"
-the change in direction of a wavefront at an interface between 2 differences media so that the wavefront returns to the medium from which it originated

Law of Reflection
-angle of incidence= angle of reflection

Types
-law of reflection is always obeyed
-Specular-smooth surfaces, produces image of the source ex. mirrors