Physical Science 20 - May 11

Today we moved on to look at critical angle and total internal reflection.  Critical angle is a special incident angle where the refracted angle will be 90 degrees.  If light tries to exit a substance at an angle greater than the critical angle, it wont be able to and it will just reflect around inside.  This is called total internal reflection.  They copied notes from slides 57-61 and worked on Part C of the Refraction Problems for the remainder of the class.  We will go over this tomorrow and begin to look at geometric optics