| A | B |
|---|
| Electromagnetic Waves | Transverse waves that transfer electric and magnetic energy |
| Electromagnetic Radiation | Energy that travels through space in the form of electromagnetic waves |
| Polarized Light | Light that vibrates in only one direction |
| Photoelectric Effect | The movement of electrons in a substance when light is shined on it |
| Photon | A tiny particle or packet of light energy |
| Electromagnetic Spectrum | The range of electromagnetic waves placed in a certain order |
| Radio Waves | Electromagnetic waves wth the longest wavelengths and lowest frequencies |
| Microwaves | Radio waves with the shortest wavelengths and the highest frequencies |
| Radar | A system of detecting reflected radio waves |
| Magnetic Resonance Imaging | A process that uses radio waves to form pictures of the inside of the human body |
| Infrared Rays | Electromagnetic waves with higher frequencies and shorter wavelengths than radio waves |
| Thermogram | An image that shows regions of different temperatures in different colors |
| Visible Light | Electromagnetic radiation that can be seen with the unaided eye |
| Ultraviolet Rays | Electromagnetic waves with frequencies higher than visible light, but lower than x-rays |
| X-rays | Electromagnetic waves with higher frequencies than ultraviolet rays, but shorter than gamma rays |
| Gamma Rays | Electromagnetic waves with the shortest wavelengths and highest frequencies |
| Illuminated | Word used to describe an object that can be seen because it reflects light |
| Luminous | Word used to describe an object that can be seen because it emits light |
| Opaque | Term used to describe a material that reflects or absorbs all light that strikes it |
| Transparent | Term used to describe a material that transmits light |
| Translucent | Term used to describe a material that scatters light as it passes through |
| Regular Reflection | Reflection that occurs when parallel rays of light hit a smooth surface and all reflect at the same angle |
| Diffuse Reflection | Reflection that occurs when parallel rays of light hit a rough surface and all reflect at different angles |
| Image | A copy of an object formed by reflected or refracted rays of light |
| Plane Mirror | A flat mirror that produces an upright, virtual image the same size as the object |
| Virtual Images | An upright image formed where rays of light appear to meet or come from |
| Concave Mirror | A mirror with a surface with curves inward |
| Focal Point | The point at which rays of light meet, or appear to meet, after being reflected (or refracted) by a mirror (or lens) |
| Real Image | An inverted image formed where rays of light meet |
| Convex Mirror | A mirror with a surface that curves outward |
| Index of Refraction | The measure of how much a ray of light bends when it enters a new medium |
| Mirage | An image of a distant object caused by refraction of light as it travels through air of varing temperature |
| Lens | A curved piece of glass or other transparent material that is used to refract light |
| Concave Lens | A lens that is thinner in the center than at the edges |
| Convex Lens | A lens that is thicker in the center than at the edges |
| Primary Colors | Three colors that can be used to make any other color |
| Secondary Colors | Any color produced by combining equal amounts of any two prime colors |
