Question

compare the focusing of the camera with focusing human eye

Answer 1

Both the camera and the human eye have a lens that focuses light into an inverted image. One major difference between the two lenses, though, is that while a camera lens moves closer or farther from an object in order to bring it into focus, the lens of the human eye stay stationary. hence,To bring an object into focus, muscles in the eye respond to instructions from the brain and change the shape of the lens, thus sharpening the image.