| A | B |
|---|
| electromagnetic spectrum | All the wavelengths of visible and invisible light in order from short waves to long waves. |
| visible light | Light that we are able to see on the electromagnetic spectrum. |
| peak (crest) | The highest point of a light wave. |
| trough | The lowest point of a light wave |
| wavelength | The measured distance from peak to peak of a light wave. |
| ray | moving in one direction from a given point |
| photon | The tiny bundles of energy in which light travels |
| transmitted | to pass trhough (i.e., Glass transmits light) |
| transparent | materials that allow light to pass through with almost no disturbance (glass, plastic wrap) |
| translucent | materials that allow only part of the light to pass through (frosted, colored glass) |
| opaque | materials completely block light from passing through (wall, table, branch) |
| reflected | the bouncing of a light wave off a surface |
| refracted | the bending of light rays as they pass from one substance to another |
| prism | a cut piece of clear glass or plastic with 2 opposite sides in the shape of a triangle |
| lens | pieces of transparent materials with curved surfaces that use the refraction of light to make images |
| concave | a lens that curves inward spreading the light rays apart |
| convex | a lens that curves outward bringing light together to make the image appear larger |
