| A | B |
|---|
| transparent | property of a material that allows enough light to pass through so that images are clearly seen on the other side |
| transluscent | property of a material that allows some light to pass through; but fuzzy images are seen on the other side |
| opaque | property of a material that allows it to absorb or reflect all of the light hitting it (no light passes through) |
| reflection | bouncing back of light from a surface |
| regular reflection | light is reflected from a smooth surface in straight orderly lines |
| diffuse reflection | light is reflected from a rough surface in many different directions |
| refraction | process of bending light when it passes from one material to another |
| infrared | light waves that provide warmth and are too long to be seen |
| visible | light waves that we can see |
| ultraviolet | light waves that cause our skin to tan or burn and are too short to be seen |
| prism | triangular glass that can break sunlight into its mixture of colors |
| spectrum | produced when sunlight passes through a prism |
| white | color obtained when all colors of light are mixed |
| black | color obtained when all colors of pigment are mixed |
| color blindness | condition that occurs when one or more kinds of cones are missing |
| red, green and blue | primary colors of light |
| yellow, magenta and cyan | primary pigment colors |
| pigment | material that absorbs some colors and reflects others |
| iris | colored area around the pupil that controls the size of the pupil according to the amount of light |
| retina | tissue sensitive to light that detects colors and shapes, lights and shadows |
| receptors | structures in the retina that respond to changes in light and color |
| cones | receptors sensitive to all colors in the visible spectrum of light |
| rods | receptors sensitive to light and dark |
