Main Page
Lessons
Angles
Pool
Oil Pump
Quads
Basic Triangles
More Triangles
Art
Web Page
Euclid
Homework
Geometry
Hon Geometry
Web Calc
Pythagorean
Square Root
Fractions
Trivia
Impossibles
Trivia Quiz
Optical Quiz
Other Links
Math Links
TI Calc
Ham Radio
Astronomy
Capuchins
FAQ
Email me!

Rainbow Lab
Link to
http://www.geom.umn.edu/education/calcinit/rainbow/
The Lab is at http://www.geom.umn.edu/education/calcinit/rainbow/rainbow.cgi
Questions
Note well:
The values for ray height should be betwen 0 and 1. This
The wavelength should between 400 nanometers and 700 nm.
 What is the wavelength for green?
 What is the wavelength for blue?
 What is the wavelength for violet?
 What is the wavelength for red?
 What is the wavelength for orange?
 Does each color bend the same? Why or Why not?
 If the angle inside the raindrop is 47 degrees,
how many degrees of arc is it between the entrance of light and the exit?
 Look at
http://www.geom.umn.edu/education/calcinit/rainbow/experiment.html
Try typing these three sets of parameters in the first column:
Set A
Send in 3 incoming beams of light at: 0.05, 0.1, 0.15
Set B
Send in 3 incoming beams of light at: 0.5, 0.55, 0.6
Set C
Send in 3 incoming beams of light at: 0.75, 0.8, 0.85
Sketch the results.
Which set has the outgoing rays the most concentrated? The most diffuse?
 For sets A, B and C, does it matter if you use the same colors or different ones?
 Look at
http://www.geom.umn.edu/education/calcinit/rainbow/conclusion.html.
Why are the colors of a rainbow experienced as separate stripes of color and not
all mixed together around each droplet? Draw a picture if it helps to explain
yourself.
 Which color is always on the top of a rainbow? Why?
