# Bands of Colour from Red to Violet

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## Description

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

#### Bands of 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. Name six bands of colour in the visible spectrum starting with red?
3. What is the band of colour with the shortest range of wavelengths?
4. Where are you most likely to see spectral colours on a rainy day?
5. What is the name of the invisible band of wavelengths next to red?

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 fact that wavelengths of light within the visible spectrum often appear to form bands of colour.

• Every wavelength of electromagnetic radiation (light) corresponds with a different colour we see in the world.
• When an observer sees a continuous range of wavelengths they see bands of colour.
• When all wavelengths within the visible spectrum are present an observer will often see six bands of colour – the colours of the rainbow, ROYGBV.
• The list on the left of the diagram shows the range of wavelengths corresponding with each band of colour.

Remember that:

• Objects appear to be different colours depending on the wavelengths that are reflected towards an observer.
• 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 one or several bands 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.

Let’s look at this in more detail:

An observer perceives bands of colour because:

The human eye is able to distinguish between some wavelengths of visible light better than others. Another factor is that some colours appear to be brighter than others to a human observer.

• Colour is not a property of electromagnetic radiation, but a feature of visual perception.
• It is the human brain that draws lines between different bands of colour when an observer looks at a rainbow for example.
• A human observer can distinguish between colours corresponding with many thousands of single wavelengths of light in the visible spectrum. These colours are called spectral colours.
• Combinations of wavelengths from different areas of the visible spectrum produce other colours when perceived by a human observer which are called non-spectral colours.
• There is no property belonging to electromagnetic radiation that causes bands of colour to appear to an observer. The fact that we do see distinct bands is often described as an artefact of human colour vision.
• The visible spectrum is formed of a smooth and continuous range of wavelengths that can be demonstrated to produce a smooth and continuous range of colours.
• Cone cells in our eyes are particularly sensitive to red, green and blue wavelengths.
• Our brains process information received from the eye to produce all the colours of the visible spectrum.

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.

#### Colour

Things appear coloured because colour corresponds with a property of light that is visible to the human eye. The visual ...

#### Electromagnetic spectrum

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

#### Spectral colour

A spectral colour is a colour evoked in normal human vision by a single wavelength of visible light, or by ...

#### Visible light

Visible light is the range of wavelengths of electromagnetic radiation perceived as colour by human observers. Visible light is a ...

#### Visible spectrum

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

#### Wavelength

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

#### 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.

#### Diagrams

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.

#### JPG file format

• 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 - PNG

1. All information, images and other assets displayed or made available for download on the lightcolourvision.org website are copyright. This means there are limitations on how they can be used.
2. All information, images and other assets displayed or made available for download are solely and exclusively to be used for personal, educational and non-profit purposes.
3. When you find the resources you need, then part of the download process involves you (the user) ticking a box to let us (at lightcolourvision.org) know we both agree how the material can be used.
4. Please contact [email protected] before considering any use not covered by the terms of the agreement above.

If you are a student, educator or researcher you might also like to read our posts Copyright: Credit where credit’s due and Citation and bibliographies before copying and pasting material into essays, assignments or other academic work. They include advice on avoiding plagiarism and how to credit other people’s words, images and assets before submitting your work for marking or assessment. If you are confused, just ask a friendly teacher, librarian, or other member of academic staff.

Like to know more?

#### AI (Adobe Illustrator) file format

• 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:

• Adobe Illustrator can save or export AI files to other formats including PDF (.pdf), PNG (.png), JPG (.jpeg) and SVG(.svg) etc.

1. All information, images and other assets displayed or made available for download on the lightcolourvision.org website are copyright. This means there are limitations on how they can be used.
2. All information, images and other assets displayed or made available for download are solely and exclusively to be used for personal, educational and non-profit purposes.
3. When you find the resources you need, then part of the download process involves you (the user) ticking a box to let us (at lightcolourvision.org) know we both agree how the material can be used.
4. Please contact [email protected] before considering any use not covered by the terms of the agreement above.

If you are a student, educator or researcher you might also like to read our posts Copyright: Credit where credit’s due and Citation and bibliographies before copying and pasting material into essays, assignments or other academic work. They include advice on avoiding plagiarism and how to credit other people’s words, images and assets before submitting your work for marking or assessment. If you are confused, just ask a friendly teacher, librarian, or other member of academic staff.

Like to know more?