Electro-Magnetic Waves II PREFLIGHT
Please type your (first) name: Please type your LAST NAME and LAST FOUR SS# digits: IN:
The following three questions refer to the material you were to read in preparation for the lesson. Questions one and three require you to write a three or four sentence response. Number two is a multiple choice question. Click in the appropriate circle.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button at the bottom of this page. Don't submit more than once. (If you absolutely HAVE to resubmit it, put a note on the end to that effect.)


1.

How is it that light goes in straight lines, but the light inside an optical fiber can bend around corners, do figure eights, and basically go any direction you want? What is so special about the light in an optical fiber?



2.

What is it that makes rainbow colors in both raindrops and prisms? Select the best answer below.

The shape. Fat on one side, skinny on the other.

The material. Water and glass are special. Diamond is even more special.

The angle. Any material will work if its at the right angle.

The light. Strong sunlight splits up into colors.

3.


Snell's Law:  n1<n2

A  light beam source is incident on a substance of unknown index of refraction.   What is the unknown index?  You can click-drag both the position and the ray angle of the beam.  Angle measurements are displayed in the yellow message box if click-drag away from the source.   Start





honors extra

My children are often breaking glass objects around my house. When this happens in the kitchen, as it often does, my wife has everyone clear the area while she carefully sweeps up all the glass. She throws out any food that might have glass in it, and generally treats it like a nuclear disaster. She's not too careful, since a shard of broken glass that falls into a water tumbler (with water in it) is invisible. Why does glass go invisible when its under water? Would a diamond be invisible too? Is there some general rule which tells us when submerging makes it invisible?




Below is a space for your thoughts, including general comments about today's assignment (what seemed impossible, what reading didn't make sense, what we should spend class time on, what was "cool", etc.):




You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT button.

I received no help from anyone on this assignment.