| A | B |
|---|
| Incandescence | Produces light with heat |
| Luminescence | Produces light with little or no heat |
| Bioluminescence | Light produced by living organisms |
| Transparent | Object that allows light to pass through |
| Translucent | Object that allow some light to pass through. |
| Opaque | Object that does not allow light to pass through. Light is absorbed or reflected. |
| Transmitted | When light passes through an object |
| Absorbed | When light is taken in by an object |
| Reflected | When light bounces off an object. |
| Refracted | When light bends as it passes through an object. |
| Concave | A lens or mirror that curves inwards. |
| Convex | A lens or mirror that curves outward. |
| Focal point | The exact point where light rays meet |
| Iris | Colored part of the eye. Opens and closes to change the size of the pupil |
| Cornea | Transparent membrane that covers the eye. Acts as a convex lens and refracts light |
| Pupil | Controls the amount of light that enters the eye |
| Lens | Convex on both sides. Turns the image upside-down. Refracts light |
| Retina | Light hits the specialized cells on this part of the eye that respond to light |
| Rods and cones | The specialized cells that detect color; allow us to see shades of gray and black and white. |
| Optic nerve | After light hits the retina, this sends the signals to the brain |
