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Light
| Question | Answer |
|---|---|
| What is reflection? | When light waves reflect, or bounce, off surfaces of most objects. Light waves change directions depending upon the surface they strike. |
| How does a mirror or any other shiny smooth object create a reflection? | Smooth, shiny surfaces reflect more light and create reflections. Examples: mirrors, metal, or water. |
| What is refraction? | Light waves refract, or bend, when they move from one transparent material to another. Such as air to glass to water. |
| How do lenses work? | A lens is a piece of curved glass, plastic, or other material that refracts light. Lenses refine an image. Example: magnifying glass, eyeglasses, or telescope. |
| What type of objects block light waves and create shadows? Give some examples of opaque objects. | Materials that block all light and create shadows are opaque objects. Examples: people, rocks, trees, and wood. |
| Objects can cast shadows that are blurry or have a sharp image. What causes the nature of shadows to change in this way? | The farther the object is from the shadow it cast, the larger and blurrier the edges. The sharper the shadow edges and size of the shadow is closer to the size of the object. |
| What determines what colors we see? Explain in terms of absorbing or reflecting light. | Most objects absorb some of the light that hits their surface. A color object absorbs some colors of the light, but reflects other colors. Black objects absorb nearly all light. White objects reflect nearly all light. |
| What is a prism and what does it do to light? | A prism is a piece of glass that separates white light into colors. A water droplet in the atmosphere can act as a prism when we see a rainbow after it rains. |
| What do translucent objects do to light waves? Give some examples of translucent objects. | An object that transmits some light, but scatters it in many directions is translucent. Objects seen through translucent materials appear blurry. Examples? |
| What do transparent objects do to light? Give some examples of transparent objects. | An object that transmits almost all light is transparent. Objects seen through transparent material are clearly seen. Examples: air, glass, clear plastic. |
| Understand the position of shadows in relationship to an object and its light source. Review "Changes between Light and Shadow" lab sheet. | Shadows are longer in the morning and evening, and shorter at noon time. The source - the sun is directly above the object that casts a short shadow. |
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