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sciencestruck.com/color-spectrum-chart

The frequency of wavelength range for indigo is around 425-450 nm and frequency of 670-700 THz. In the above color spectrum chart, indigo is made a subset of violet color. The low range of the color explains why it is difficult to distinguish this color in the spectral band.

en.wikipedia.org/wiki/Visible_spectrum

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.A typical human eye will respond to wavelengths from about 380 to 740 nanometers. In terms of frequency, this corresponds to a band in the vicinity of 430–770 THz.

www.thoughtco.com/the-visible-light-spectrum-2699036

Wavelength and Color Spectrum Chart . The wavelength of light, which is related to frequency and energy, determines the perceived color. The ranges of these different colors are listed in the table below. Some sources vary these ranges pretty drastically and their boundaries are somewhat approximate, as they blend into each other. The edges of ...

hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html

Spectral Colors. In a rainbow or the separation of colors by a prism we see the continuous range of spectral colors (the visible spectrum).A spectral color is composed of a single wavelength and can be correlated with wavelength as shown in the chart below (a general guide and not a precise statement about color).

en.wikipedia.org/wiki/Electromagnetic_spectrum

The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies.. The electromagnetic spectrum covers electromagnetic waves with frequencies ranging from below one hertz to above 10 25 hertz, corresponding to wavelengths from thousands of kilometers down to a fraction of the size of an atomic nucleus.

en.wikipedia.org/wiki/Color

Color categories and physical specifications of color are associated with objects through the wavelength of the light that is reflected from them. This reflection is governed by the object's physical properties such as light absorption, emission spectra, etc.

www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/UV-Vis/spectrum.htm

The remaining light will then assume the complementary color to the wavelength(s) absorbed. This relationship is demonstrated by the color wheel shown on the right. Here, complementary colors are diametrically opposite each other. Thus, absorption of 420-430 nm light renders a substance yellow, and absorption of 500-520 nm light makes it red.

www.livephysics.com/physical-constants/optics-pc/wavelength-colors

Approximate wavelength (in vacuum) For the various colors. 1 Angstrom = 10-10 meters.. The order of colors in light, arranged from shortest wavelength to longest, is called the visible spectrum of light.

www.flutopedia.com/sound_color.htm

The resonant color of light that is 40 octaves above an F # 4 at standard pitch A4=440 has a frequency of 406.81 THz. This color has a wavelength of 736.93 nm. The equivalent RGB colors (shown above) that approximate this color of light are #750000, based on a modified version of Dan Bruton's color approximation algorithm.

en.wikipedia.org/wiki/List_of_colors_by_shade

Magenta is variously defined as a purplish-red, reddish-purple, or a mauvish–crimson color. On color wheels of the RGB and CMY color models, it is located midway between red and blue, opposite green. Complements of magenta are evoked by light having a spectrum dominated by energy with a wavelength of roughly 500–530 nm.