These should play full screen if you expand the window. You may be able to access them on YouTube directly, but sometimes that doesn't work at school.
Light and Shadows (Genova, 5:41)
Determining the length of a shadow on a screen, or doing similar calculations.
Light and Shadows, Advanced (Genova, 8:44)
Shadow problems that require a little more work. Honors level.
Can They See Each Other? (Genova, 2:56)
When given the placement of two people and a flat mirror, determine if they can see each other.
Where Should the Mirror Go? Fraction Method (Genova, 3:20)
Given two people's locations in a room, where would you place a flat mirror so they can see each other?
Where Should the Mirror Go? Algebraic Method (Genova, 3:25)
Using algebra to determine where to place a mirror so two people can see each other.
Refraction (Genova, 5:58)
How to determine if lights speeds up or slows down when it enters a new medium, and which direction will it bend.
Investigating an Unknown Medium (Genova, 3:55)
Using the Phet simulator to estimate the index of refraction of an unknown medium.
Relating Speed of Light to Index of Reaction (Genova, 3:04)
Finding the speed of light in a medium, or determining a medium's index of refraction from its speed of light. Honors level only
Is a Critical Angle Possible? (Genova, 3:06)
Given two different media, determine if it is possible for light moving between them to bounce off the 2nd medium completely. Typically Honors level only.
Calcaluate the Critical Angle (Genova, 3:06)
If a critical angle between two media is possible, calculate what it is. Note: this video always assumes that one of the substances is air. Honors level only.