| A | B |
|---|
| luminous | gives off light |
| opaque | light cannot pass through and object casts shadow |
| translucent | allows light to pass through; cannot see objects clearly |
| spectrum | the six colors in sunlight |
| ultraviolet | invisible light that causes tanning or burning |
| compound eyes | large eyes of an insect |
| green | color reflected when object absorbs all other colors |
| 186,000 | speed of light |
| tapetum | layer of cells behind the the retina of nocturnal animals some animals |
| Thomas Edison | invented the lightbulb |
| cornea | transparent layer that protects the eye |
| optic nerve | bundle of fibers carrying messages to the brain |
| pupil | dark opening allows light to enter eye |
| iris | changes the size of the pupil |
| retina | lining of eyeball which is like film in a camera |
| lens | convex cluster of cells creating which frefracts and focuses light |
| farsighted | can see at a distance |
| nearsighted | cannot see things at a distance |
| compound eye | large eye on insect that is made up of thousands of lenses |
| eyeshine | light reflected by tapetum back to the retina |
| monocular vision | sight of animals with eyes on two different sides of their head; their eyes move independently of each other |
| binocular vision | eyes that work together to produce an image of the same object; humans have this type of vision |
| Anton van Leeuwenhoek | early developer of the microscope |
| fire | artificial light caused by heating things up |
| Sir Isaac Newton | invented a reflecting telescope using mirrors and lenses |
