Human vision and function/Part 1: How the eye works/1.1 What is light?

From Wikiversity
Jump to navigation Jump to search
Glühwendel brennt durch

1.1 What is light[edit | edit source]

This topic introduces you to the concept of light and the visible electromagnetic spectrum. The theories of light behavior will be discussed and you will gain understanding as to why light is important for the visual system.

Task[edit | edit source]

Begin by watching this short group of Youtube videos:

Supplementary reading[edit | edit source]

To gain a deeper understanding of the concepts of light and the electromagnetic spectrum, wave theory and quantum theory of light follow this supplementary reading link

Revision questions[edit | edit source]

Discuss the answers to these questions on your group LMS forum.

  1. How can you best define “light”?
  2. Which wavelengths of light are visible to the human eye?
  3. Does the speed of light change depending on the wavelength it emits?
  4. What is the main difference between the wave theory of light compared with the quantum theory?
  5. When we look at a coloured object, for example a red apple, why does it appear red?
  6. What is refraction of light?
  7. Define constructive and destructive interference of waves
  8. What is the “photoelectric effect”?

Answers