When PhET ported its legacy Flash and Java sims into HTML5, some characteristics of the sims changed. Some of the changes broke some of the activities I had written for the original simulations.
Here are the activities I've written for sims involving light and optics.
Pixel Peeping [Color Mixing] at PhET
Using PhET's Color Mixing sim, use a magnifier to examine the pixels of a computer display and see how the display’s colors are created. This activity is included in the Conceptual Physics 12th edition lab manual at Pearson.
Fun With Colors [Color Mixing] copy from my Google Drive
I used this activity as an extension of Pixel Peeping. No magnifier required.
Fringe of Optics [Interference] at PhET
Using PhET's Wave Interference sim, construct the mathematical relationship describing interference patterns.