Tuesday, August 21, 2007
COMPARISON OF A HUMAN EYE TO A CAMERA
this is one of the must-post topics so here it goes...
(Pretty much the same with the website but I thoroughly read it (>_<("') )
Human eyes have often been compared to cameras. They are alike in terms of structure, but they have one fundamental difference in functioning mechanism.
DIAGRAM From ://library.thinkquest.org/28030/media/evocam5.gif
| Function | Camera | Human Eye |
|---|
SIMILARITIES
|
| 1. | opening for light to enter | aperture | pupil |
| 2. | control the amount of light entering camera/eye | diaphragm control size of aperture | iris muscles control size of pupil |
| 3. | refract light | glass biconvex lens | mainly cornea ;
lens, aqueous & vitreous humor |
| 4. | object of light action to form image | photosensitive chemicals on film | photoreceptors(rods & cones) in retina |
| 5. | absorb excessive light to prevent multiple images formation | dark internal surface | pigmented, dark chloroid |
| Difference |
| 1. | focusing mechanism | change distance between lens & film | change focal length of lens using ciliary muscles |
Death Note
