Wavelengths Between Red and Violet

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Description

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

Wavelengths from Red to Violet

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

Is visible light a form of electromagnetic radiation?
Do different wavelengths of light correspond with different colours seen by an observer?
What is the unit of measurement for wavelengths of visible light?
What is the name of the invisible band of wavelengths next to red?
Name two colours with the long 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 which wavelengths of electromagnetic radiation correspond with the different colours we see in the world.

It shows that whilst the visible spectrum often appears to an observer to be made up of six bands of colour, every wavelength between 700 and 380 nanometres corresponds with a different colour.

The scale along the bottom of the diagram is marked in nanometres with the corresponding colours shown above.

Remember that:

Objects appear to be different colours to an observer depending on the wavelengths they reflect.
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.

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 ...

Rainbow

A rainbow is an optical effect produced by illuminated droplets of water. Rainbows are caused by reflection, refraction and dispersion ...

ROYGBV

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

Visible light

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

Wavelength

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

White light

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

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

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.

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.