Create an account
A cut piece of glass (or plastic) with two opposite sides in the shape of a triangle or other geometric shape.
Law of Reflection
The angle between an incoming light ray and a surface equals the angle between the reflected light ray and the surface.
Magenta, Cyan, or Yellow. Materials with any of these colors absorb one primary color of light and reflect the other two.
A lens that is thicker at the middle than at the edges. As it curves outward, it brings light together, making images appear larger.
Red, Green, or Blue. Mixing light of these colors can produce all the colors of the spectrum.
A lens that is thicker at the edges than at the middle. As it curves inward, it spreads light rays apart, making images appear smaller.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together