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If you mean, "which wavelengths of light can the human eye detect," the human eye can see wavelengths from about 390 to 700 nanometers.
how does the eye respond to light rays to manifest far sightedness
Black objects absorb all or most of the visible wavelengths of light, whereas white objects reflect all wavelengths. When all visible wavelengths (violet to red) enter the eye in equal proportions, the color is perceived as white. When no wavelengths reach the eye, the color is perceived as black. Every other color is a mixture of this continuum of wavelengths.
sight
This is a bit of a circular answer: Because the "red" color receptors in the human eye respond to the longer wavelengths of visible light more intensely than the "green" or "blue" color receptors do.
If you mean, "which wavelengths of light can the human eye detect," the human eye can see wavelengths from about 390 to 700 nanometers.
how does the eye respond to light rays to manifest far sightedness
Black objects absorb all or most of the visible wavelengths of light, whereas white objects reflect all wavelengths. When all visible wavelengths (violet to red) enter the eye in equal proportions, the color is perceived as white. When no wavelengths reach the eye, the color is perceived as black. Every other color is a mixture of this continuum of wavelengths.
There are not different "forms" of light. There are, however, various wavelengths of light. A small portion of which we can see as "visible light," and most of which we cannot see directly with the human eye.
The color spectrum refers to the color produced when light is dispersed through a prism and is visible to the human eye. Typically, a human eye will respond to color occurring at wavelengths from 390 to 770nm.
It will be right to say that only principles of light microscopy keeps light focused and scatters wavelengths of visible light for the human eye to see.
sight
rod and cone cells
Because it's comprised of the band of wavelengths that the human eye can detect, that is, wavelengths that are 'visible' to human beings.
Color blindness is the failure of the red sensitive nerves in the eye that don't respond to light properly.
This is a bit of a circular answer: Because the "red" color receptors in the human eye respond to the longer wavelengths of visible light more intensely than the "green" or "blue" color receptors do.
The human eye's sensitivity to wavelengths in the visual window of Earth's atmosphere is due to evolution adaptations during the development of the human eye. If infrared radiation were in abundance, then it is believed our eyes would be sensitive to infrared radiation.