# Color and wavelength relationship

### Relationship Between Color and Light

Relationship Between Color and Light. appears red because it tends to reflect light in the red portion of the spectrum and absorb light of other wavelengths. Wavelength and Color Main Concept The human eyes are only sensitive to light Functions and Relations; Gradeable Apps; Graphing; Logic and Puzzles. Over the course of millions of years, the human eye has evolved to detect light in the range —nm, a portion of the electromagnetic spectrum known as.

In the same manner, the green cone is most sensitive to wavelengths of light associated with the color green.

### Visible Light and the Eye's Response

Yet the green cone can also be activated by wavelengths of light associated with the colors yellow and blue.

The graphic below is a sensitivity curve that depicts the range of wavelengths and the sensitivity level for the three kinds of cones.

The cone sensitivity curve shown above helps us to better understand our response to the light that is incident upon the retina. While the response is activated by the physics of light waves, the response itself is both physiological and psychological.

Suppose that white light - i.

### Light & Color: Facts (Science Trek: Idaho Public Television)

Upon striking the retina, the physiological occurs: The cones respond to the incident light by sending a message forward to brain, saying, "Light is hitting me. The brain responds by saying "it is white. And the brain recognizes that the messages are being sent by all three cones and somehow interprets this to mean that white light has entered the eye.

Now suppose that light in the yellow range of wavelengths approximately nm to nm enters the eye and strikes the retina.

Light with these wavelengths would activate both the green and the red cones of the retina. Once received by the brain, the psychological occurs: In this sense, the yellow appearance of objects is simply the result of yellow light from the object entering our eye and stimulating the red and the green cones simultaneously.

If the appearance of yellow is perceived of an object when it activates the red and the green cones simultaneously, then what appearance would result if two overlapping red and green spotlights entered our eye?

Absorption in the visible region - Spectroscopy - Organic chemistry - Khan Academy

Using the same three-cone theory, we could make some predictions of the result. Red light entering our eye would mostly activate the red color cone; and green light entering our eye would mostly activate the green color cone. Each cone would send their usual electrical messages to the brain. If the brain has been psychologically trained to interpret these two signals to mean "yellow", then the brain would perceive the overlapping red and green spotlights to appear as yellow.

To the eye-brain system, there is no difference in the physiological and psychological response to yellow light and a mixing of red and green light. The brain has no means of distinguishing between the two physical situations. In a technical sense, it is really not appropriate to refer to light as being colored.

Light is simply a wave with a specific wavelength or a mixture of wavelengths; it has no color in and of itself. An object that is emitting or reflecting light to our eye appears to have a specific color as the result of the eye-brain response to the wavelength. So technically, there is really no such thing as yellow light. Rather, there is light with a wavelength of about nm that appears yellow.

## Light & Color: Facts

And there is also light with a mixture of wavelengths of about nm and nm that together appears yellow. The yellow appearance of these two clearly different light sources can be traced to the physiological and psychological response of the eye-brain system, and not to the light itself.

Make the top line red, the middle line green and the bottom line violet to represent three different colors in the spectrum of light. He or she may also share in the completion of the tasks. Recorder should divide the red line every 14 cm with dark marks in red pencil. The green line should be divided every 10 cm and the violet every 8 cm. The marks that you make on the three color lines will represent the different wavelengths of the different colors of light.

The true wavelengths are actually measured in terms of angstroms.

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An angstrom is cm or 0. Red has a wavelength of angstroms, green has a wavelength of angstroms and violet has a wavelength of angstroms. However, in this lab, the simple relationship among the visible light waves will be what is important. Materials Manager should use masking tape to fasten the marked adding machine tape to a pencil.

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Recorder should cut a manila folder along its crease. Then cut a rectangle out of the center of one of the long sides. This rectangle should be about 10 cm high and 5 cm wide as shown below. Materials Manager should set the manila folder cut out on the table supporting it with the four books see below. Feed the end of the adding machine tape through the narrow space between the manila folder and the two back books until "Start" appears in the middle of the opening in the manila folder.