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Learn how light is a form of electromagnetic radiation with different wavelengths and colors. Explore how objects reflect and absorb light, and how animals see different colors than humans.
- How We See Color
The color of light coming from an object is what gives it...
- Energy
Energy is the ability to do work. Scientists define "work"...
- Earth
Earth is the dynamic planet that we call home. It formed...
- Credits
The initial development of OLogy was made possible by a...
- Brain
Seeing Color We see with our eyes, but our brains do most of...
- Astronomy
Astronomy is the study of the Universe and everything in it,...
- Microbiology
Microbiology is the study of bacteria, viruses, and other...
- Games
Play these games and test your knowledge! On the OLogy...
- How We See Color
- Visible Light
- Colour of Objects
- Colour Detection
- Mixing Colours
Visible light is the small part within the electromagnetic spectrum2that human eyes are sensitive to and can detect. Visible light waves consist of different wavelengths. The colour of visible light depends on its wavelength. These wavelengths range from 700 nm at the red end of the spectrum to 400 nm at the violet end. White light is actually made...
Objects appear different colours because they absorb some colours (wavelengths) and reflected or transmit other colours. The colours we see are the wavelengths that are reflected or transmitted. For example, a red shirt looks red because the dye molecules5in the fabric have absorbed the wavelengths of light from the violet/blue end of the spectrum....
The retina6of our eyes contains two types of photoreceptors – rods and cones. The cones detect colour. The rods only let us see things in black, white and grey. Our cones only work when the light is bright enough, but not when light is very dim. This is why things look grey and we cannot see colours at night when the light is dim. There are three t...
The primary colours of light7are red, green and blue. Mixing these colours in different proportions can make all the colours of the light we see. This is how TV and computer screens work. If you look at a screen with a magnifying glass you will be able to see that only these three colours are being used. For example, red and green lights are used t...
May 27, 2024 · Colour - Visible Spectrum, Wavelengths, Hues: Newton demonstrated that colour is a quality of light. To understand colour, therefore, it is necessary to know something about light. As a form of electromagnetic radiation, light has properties in common with both waves and particles.
- Kurt Nassau
Colors that can be produced by visible light of a narrow band of wavelengths (monochromatic light) are called pure spectral colors. The various color ranges indicated in the illustration are an approximation: The spectrum is continuous, with no clear boundaries between one color and the next.
Jan 16, 2021 · The eyes and brain see many more colors than those of the visible light spectrum. For example, purple and magenta aren’t on the spectrum. They are the brain’s way of connecting red and purple. There are also desaturated and blended colors, such as pink and brown. Mixing pigments on a palette forms hues and tints that aren’t ...
Colors of the Visible Light Spectrum. Here’s an overview of the colors of visible light and their wavelengths: Violet: 400 – 450 nm. Blue: 450 – 500 nm. Cyan: 500 – 550 nm. Green: 550 – 580 nm. Yellow: 580 – 600 nm. Orange: 600 – 650 nm. Red: 650 – 700 nm. Violet: 400 – 450 nm. Violet light has a wavelength between 400 and 450 nm.
Color is a function of the human visual system, and is not an intrinsic property. Objects don't have a color, they give off light that appears to be a color. Spectral power distributions exist in the physical world, but color exists only in the mind of the beholder.
