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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 405–790 THz.

www.difference.wiki/red-light-vs-blue-light

The light rays that have a higher wavelength and appear red in color are known as red light whereas, the light rays of the low wavelength that appears blue in color are known as blue light. The rays of red light have a longer wavelength, i.e., 625–740 nm. On the other hand, blue light rays have shorter wavelengths, i.e., 450–485 nm.

www.differencebetween.com/difference-between-red-and-vs-blue-light

Key Difference – Red vs Blue Light The key difference between Red and Blue light is the impression created at the human retina. It is the perceptive understanding of the difference between two wavelengths. Characteristics of Red Light and Blue Light . Some creatures cannot see different colours except black and white.

www.thoughtco.com/understand-the-visible-spectrum-608329

The human eye sees color over wavelengths ranging roughly from 400 nanometers (violet) to 700 nanometers (red). Light from 400–700 nanometers (nm) is called visible light, or the visible spectrum because humans can see it.Light outside of this range may be visible to other organisms but cannot be perceived by the human eye.

en.wikipedia.org/wiki/Color

Color (American English), or colour (Commonwealth English), is the characteristic of visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple.This perception of color derives from the stimulation of photoreceptor cells (in particular cone cells in the human eye and other vertebrate eyes) by electromagnetic radiation (in the visible ...

www.asu.edu/courses/phs208/patternsbb/PiN/rdg/color/color.shtml

Three typical waves of visible light are shown in Fig. 2. The wavelength is the distance from one wave crest to the next, and is represented by the Greek letter lambda, λ. Violet light is electromagnetic radiation with wavelengths of 410 nanometers and red light has a wavelength of 680 nanometers.

www.answers.com/Q/Wavelength_of_red_color

The visible red light has a wavelength of about 650 nm. At sunrise and sunset, red or orange colors are present because the wavelengths associated with these colors are less efficiently scattered ...

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

The image below shows light's visible spectrum, which runs from violet to red. You might recognize the spectrum as the order of colors in a rainbow. But light waves can also have wavelengths lower or higher than the wavelengths in the visible spectrum, and many familiar types of radiation are just light waves with other wavelengths.

www.sciencelearn.org.nz/resources/47-colours-of-light

For example, a red shirt looks red because the dye molecules in the fabric have absorbed the wavelengths of light from the violet/blue end of the spectrum. Red light is the only light that is reflected from the shirt. If only blue light is shone onto a red shirt, the shirt would appear black, because the blue would be absorbed and there would ...

www.answers.com/Q/What_is_the_wavelength_of_blue_light

Blue light has a wavelength of 450-495 nm (nanometers or billionths of a meter). It falls in the higher frequency of the visible light spectrum. Red has the longest wavelength (620-750 nm) and ...