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DIDAVISION


�WHAT IS LIGHT?


WHAT IS LIGHT?
WHAT IS LIGHT?

Description of lights natural properties. Its relationship with colour. Different behaviours in air or water. Sources of light. Electromagnetic waves. Speed of light. Summary.


INTRODUCTION

- Definition of Light
- As far back as the 17th Century, scientists could not agree upon the nature of light.
- There are many questions we can ask ourselves about light.

THE NATURE OF LIGHT
- How is light transmitted? The photons.
- The light and the electromagnetic waves.
- The eye distinguises colours
- Isaac Newton was the first person to discover that white light is really made up of
different colours.
- The colours. The different wavelengths.

ACCESS TO LIGHT SOURCES
- Light sources
- The Sun
- Light bulbs how do they function?
- Paraffin lamps
- The photons
- Colours and spectra

THE DIFFUSION OF LIGHT
- How is light normally diffused?
- Light can also pass through gases
- Light can also pass through water
- Performance of light while passing through different objects.
- The lenses of telescopes
- Translucent bodies

SPEED
- In the old days, it was thought that light was diffused instantly.
- The speed of light
- Different times of the speed of light


SUMMARY

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