| A | B |
|---|
| Reflection | Light rays that bounce back after they hit a smooth, shiny surface. |
| Refraction | The bending of light rays |
| Photons | Tiny particles of light |
| Rays | Straight lines that light travels in |
| Waves | A travelling disturbance that carries sound or light |
| Sound | Energy caused by vibrating objects. |
| Concave Lenses | Thinner in the middle, helps see things in the distance |
| Convex Lenses | Thicker in the middle, helps see things close to you. |
| Pitch | The quality of being high or low. |
| Amplitude | Measurement from rest to crest or rest to trough. |
| Crest | The highest point of a wave. |
| Trough | The lowest point of a wave. |
| Frequency | The number of wavelengths in a certain amount of time. |
| Hertz | The label for frequency |
| Transverse wave | Light and electromagnetic waves are an example. |
| Longitudinal Wave | A sound wave is an example. |
| Surface wave | The waves at the ocean are an example. |
| Medium | The substance a wave travels through. |
