Colors of Light


Monday began with an attempt to outline the sequence followed by the Limits of Light video that is used to introduce this week that focusing on the spectrum of light and the colors of light. This diagram was perhaps less illuminating than the one from last spring term. I suspect that the spring term diagram with additional notes on the video starting in yellow might be more logical and make more visual sense.


On Wednesday I had the students view the visible spectrum using CD spectrometers.

Alathea and Renae

Darian and Aryolynn


Using input from the students listed the colors seen in the spectrum and discussed the origin of the seven color rainbow. 

Thursday opened with the physics of color vision and digitally produced color. Desmos was used to explore color as was done spring 2023 using the new color command.


A Desmos graph can be used to illustrate the relationship between the color and the hue angle. Another Desmos file displays the primary, secondary, and tertiary colors. Desmos uses angles in the trigonometric sense. 0° is on the positive x-axis and the angles are arranged counter-clockwise from the x-axis. 180° is on the negative x-axis. See also rgb and hsv using variables on sliders and a Desmos file that converts RGB to HSV.

The microscope was again pre-positioned on Wednesday in order to come to equilibrium with ambient temperature and humidity. The yellow towel was optimal for this laboratory after a video covered Vsauce's real yellow versus fake yellow.


A picture was taken of the towel and the cell phone was then put under the microscope with that picture. This worked far better than the spectrum diagram because the towel is obviously yellow.


The same was done with my "minus green" shirt. I put this image on the cell phone under the microscope as well.

The morning diagram seemed sloppy and was erased between the sections.

The rebuilt and cleaned up diagram for 11:00

Friday covered blue light, black light, and microplastics

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