The diff. bet. the eyes and the camera....
Camera
A camera forms a real inverted, reduced image of the object being photographedon a light- sensitive surface. The amount of light striking this surface is controlled by the shutter speed and the aperature. The intensity of this light is inversely proportional to the square of the f-number of the lens.
f-number= focal length
aperature diameter
= f/d
Eyes
In the eye, refraction at the surface of the cornea forms a real image on the retina. adjustment for various object distances is made by squeezing the lens, thereby making it bulge and decreasing its focal length. A near sighted eye is too long for its lens; a farsighted eye is too short. The power of corrective lens, in diopters, is the reciprocal of the focal length in meters.
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