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"Visible" electromagnetic radiation is radiation with wavelengths between roughly

390 to 750 nanometers. (0.000350 to 0.000750 millimeters)

-- If electromagnetic radiation with a wavelength in this range enters your eye,

you know it, because the retina of your eye responds to these wavelengths.

-- If radiation enters your eye but its wavelength is not in this range, you don't

notice it.

-- If there is radiation in the neighborhood with wavelength in this range but it

doesn't enter your eye, then you don't notice it.

(If a flashlight shines a spot on the wall across the room, you don't see the shaft

of light on its way across the room. You see it only after the light hits the wall and

some of it bounces off the wall and into your eyes. )

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14y ago

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