Continuous Colour from Red to Violet

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Description

To find out more about the diagram above . . . . read on!

Continuous Colour from Red to Violet

Look carefully at the diagram at the top of the page. Now check out the following questions (and answers)!

  1. Is visible light a form of electromagnetic radiation?
  2. Do different wavelengths of light correspond with different colours seen by an observer?
  3. How many different colours can the human eye see in ideal conditions?
  4. Name two colours with the longest wavelengths?
  5. Name two colours with the shortest wavelengths?

About the Diagram

Introducing the diagram! Read back and forward between the image at the top of the page and the explanation below!

This diagram is about the visible spectrum and which wavelengths of electromagnetic radiation correspond with the different colours we see in the world.

  • It shows that a human observer can distinguish between colours corresponding with thousands of wavelengths of visible light.
  • The visible spectrum (a rainbow for example) can be thought of as six bands of colour or as being made up of light rays of different wavelengths, each distinguished by its measurement in nanometres.
  • The visible spectrum is made up of an infinite gradation of wavelengths and colours. The total number of colours in the world is limited only by the sensitivity of human vision and the size of the units of measurement used to calculate wavelength.
  • The list down the left of the diagram represents the visible spectrum as bands of wavelengths and bands of colour.
  • The scale along the bottom marks out the visible spectrum in nanometres with the corresponding colours shown above.

Remember that:

  • Objects appear to be different colours to an observer depending on their wavelength.
  • The name given to light that contains all wavelengths of the visible spectrum is white light.
  • When all wavelengths contained in white light reflect off a neutral coloured surface then the object appears white to an observer.
  • When a narrow band of wavelengths reflect off a neutral coloured surface then the object appears coloured to an observer.
  • The colour an observer sees depends on the wavelengths of visible light emitted by a light source and on which of those wavelengths are reflected off an object.
  • Although a human observer can distinguish between many thousands of wavelengths of light in the visible spectrum our brains often produce the impression of bands of colour.

Follow the blue links for definitions . . . . or check the summaries of key terms below!

Some Key Terms

Move to the next level! Check out the following terms.

Electromagnetic spectrum

The electromagnetic spectrum includes electromagnetic waves with all possible wavelengths of electromagnetic radiation, ranging from low energy radio waves through ...
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Rainbow colours

Rainbow colours are the bands of colour seen in rainbows and in other situations where visible light separates into its ...
Read More

ROYGBV

ROYGBV is an acronym for the sequence of hues (colours) commonly described as making up a rainbow: red, orange, yellow, ...
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Visible spectrum

The visible part of the electromagnetic spectrum is called the visible spectrum. The visible spectrum is the range of wavelengths ...
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Wavelength

Wavelength is a measurement from any point on the path of a wave to the same point on its next ...
Read More

White light

White light is the name given to visible light that contains all wavelengths of the visible spectrum at equal intensities ...
Read More

More Information

ABOUT SLIDES

Slides


All images on the lightcolourvision.org website are available for download as either slides or diagrams.

All slides share common specifications:

  • Titles: All slides have titles.
  • Backgrounds: Black, framed with a violet gradient.
  • Size: 1686 x 1124 pixels (3:2 aspect ratio).
  • Slides are available in two file formats: JPG, AI (Adobe Illustrator).

Slides are optimized for viewing on-screen or with a projector.
Diagrams are optimized for printing on A4 pages in portrait format.

ABOUT DIAGRAMS

Diagram


All images on the lightcolourvision.org website are available for download as either slides or diagrams.

All diagrams share common specifications:

  • Titles: No titles.
  • Backgrounds: White.
  • Size: 1686 pixels wide. So all diagrams reproduce at the same scale when inserted into Word documents etc.
  • Labels: Calibri 24pt Italic.
  • Diagrams are available in two file formats: JPG, AI (Adobe Illustrator).

Diagrams are optimized for printing on A4 pages in portrait format.
Slides are optimized for viewing on-screen or using a projector.

FILE TYPES - JPG

JPG file format


Download the image at the top of this page as a JPG file:

  • All JPG images available for download are 1686px wide.
  • Text on JPG images with white backgrounds is styled as Calibri 24pt Italic.
  • If the image you need is not exactly right, download it as an AI (Adobe Illustrator) file and edit it.
  • All the images on these Resource Pages were created in Adobe Illustrator and are vector drawings.

Did you know:

  • JPG stands for Joint Photographic Experts Group who created the standard.
  • The JPG file extension is used interchangeably with JPEG.
  • JPG files can be compressed for use on websites.
  • JPG files can be placed or pasted directly into MS Office documents.

FILE TYPES - AI

AI (Adobe Illustrator) file format


Download the image at the top of this page as an AI (Adobe Illustrator) file:

  • All AI images available for download from lightcolourvision.org are 1686px wide.
  • All the images on these Resource Pages were created in Adobe Illustrator and are vector drawings.
  • Vector drawing can be scaled up or down without any loss of quality.

Did you know:

  • AI  files downloaded from lightcolourvision.org can be re-edited using Adobe Illustrator for your own personal use.
  • Adobe Illustrator can save or export AI files to other formats including PDF (.pdf), PNG (.png), JPG (.jpeg) and SVG(.svg) etc.

DOWNLOAD AGREEMENT

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