| A | B |
|---|
| Electromagnetic spectrum | range of electromagnetic waves |
| Visible spectrum | seven colors that make up white light |
| Light | form of electromagnetic energy made up of streams of photons |
| Photon | tiny bundles of energy |
| Ray | straight line that shows the direction of light |
| Transverse | waves in which the particles of the medium move up & down at right angles to the direction of the wave |
| Luminous | object that gives off its own light |
| Illuminated | object that reflects light |
| Opaque | a property that does not transmit light |
| Transparent | a property that transmits light & preserves an image |
| Translucent | a property that transmits some light & blurs an image |
| Photosynthesis | process by which plants use energy from the sun to make food |
| Chlorophyll | substance in plants that absorbs the Suns light & gives plants their green color |
| Chloroplast | part of green plant cells where photosynthesis takes place |
| Lens | transparent material that bends light |
| Real image | image that can be projected onto a screen |
| Virtual image | image that cannot be projected onto a screen |
| Convex lens | lens that curves outward |
| Concave lens | lens that curves inward |
| Eye | sence organ that detects light |
| Sight | one of the five human senses |
| Image | picture formed by the eye |
| Regular reflection | reflection that forms a clear image |
| Diffuse reflection | reflection that forms a fuzzy image |
| Plane mirror | smooth surface that reflects light & forms images |
| Prism | triangular piece of transparent glass that separates white light into a band of colors |
| Dispersion | separation of white light into its component colors |
| Laser | device that produces a powerful beam of light |
| Total internal reflection | occurs when light is repeatedly reflected whithin a given material |
| Fiber optics | use of optical fibers |
