# Sensitivity of Human Eye to Visible Light

\$0.00

SKU: N/A Category:

## Description

#### Sensitivity of Human Eye to Visible Light

###### TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
Researchers estimate the number of colours the human eye can distinguish is between one and seven million.
The trichromatic colour model is a theory of colour that establishes terms, rules and methods to enable human colour vision to be dealt with in both systematic and practical ways.
Yes! Every spectral colour corresponds with a single wavelength of visible light.

• In this context the term ‘sensitivity of the eye’ refers to the varying response of the rods and cones in the human eye to different wavelengths of light.
• The diagram illustrates the varying response of the eye to wavelengths between approximately 380 and 700 nanometres (nm). These are the wavelengths of the visible colour spectrum.
• The information is in the form of a graph. The vertical axis shows the variation in sensitivity in degrees on a scale between zero and 100%.
• The horizontal axis arranges the scale of wavelengths to reflect the commonly used sequence of ROYGBV. In this arrangement red (700 nm) is at the origin of the two axes on the left and violet (380 nanometres) is on the right.
• The diagram splits the spectrum into 150 different wavelengths from red to violet but there are 198 colours in total from infrared to ultraviolet which are both shown as black.
• Breaks in the cyan line along the bottom of the curve identify the position of ROYGBV. Below the cyan line is another line of colours which shows the range of wavelengths associated with each each spectral colour.
• To find out more about the way that the range of colours used in this diagram have been selected see (add link).

#### Some key terms

Colour is not a property of electromagnetic radiation, but a feature of visual perception by an observer.

A human observer is a person who engages in observation by watching things.

A photon is the basic building block of light. A photon is a single indivisible bundle (particle or wave) of energy within an electromagnetic field.

• SLIDES are optimized for viewing on-screen.
• ILLUSTRATIONS are optimized for printing on A4 pages in portrait format.
###### SLIDES
• Slides are available in JPG and AI (Adobe Illustrator) file formats.
• Titles: Slides have titles.
• Backgrounds: Black.
• Size: 1686 x 1124 pixels (3:2 aspect ratio).
###### ILLUSTRATIONS
• Illustrations are available in JPG and AI two file formats.
• Titles: No titles.
• Backgrounds: White.
• Size: 1686 x 1124 (3:2 aspect ratio). So all illustrations reproduce at the same scale when inserted into Word documents etc.
• Labels: Calibri 24pt Italic.

#### File formats: JPG & AI

• JPG (JPEG) diagrams are 1686 x 1124 pixels (3:2 aspect ratio).
• If a JPG diagram doesn’t fit your needs, you can download it as an AI (Adobe Illustrator) file and edit it yourself.
• JPG files can be placed or pasted directly into MS Office documents.
• All AI (Adobe Illustrator) diagrams are 1686 x 1124 pixels (3:2 aspect ratio).
• All our diagrams are created in Adobe Illustrator as vector drawings.
• Save as or export AI files to other formats including PDF (.pdf), PNG (.png), JPG (.jpeg) and SVG(.svg) etc.

#### Spelling: UK & US

We use English (UK) spelling by default here at lightcolourvision.org.

###### COPY & PASTING TEXT
• After copy/pasting text please do a spell-check to change our spelling to match your own document.
• Download AI versions of diagrams to change the spelling or language used for titles, labels etc.
• We are adding American English (US) versions of diagrams on request. Just contact us and let us know what you need.

Light, Colour, Vision & How To See More (https://lightcolourvision.org) : Copyright © 2015-2022 : MediaStudies Trust.

Unless stated otherwise the author of all images and written content on lightcolourvision.org is Ric Mann.

No part of this website may be copied, displayed, extracted, reproduced, utilised, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical or otherwise including but not limited to photocopying, recording, or scanning without the prior written permission of MediaStudies Trust.

###### EXCEPTIONS

Exceptions to the above statement are made for personal, educational and non-profit purposes:

Before downloading, cutting and pasting or reproducing any information, images or other assets found on lightcolourvision.org we ask you to agree to the following terms:

1. All information, images and other assets displayed and 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 on how the material can be used.
4. Please contact [email protected] before considering any use not covered by the terms of the agreement above.

The copyright to all information, images and all other assets (unless otherwise stated) belongs to:

The Trustees. MediaStudies Trust
111 Lynbrooke Avenue
Blockhouse Bay
Auckland 0600
New Zealand
[email protected]

#### We love feedback

Your name and email address will be used solely to provide you with information you have specifically requested. See our privacy policy at https://lightcolourvision.org/privacy/.

## We welcome your feedback 🙂

Note: The feedback form records the URL of the current page

Thank you so much for your time and effort