6. On the Nature of Light: the Two-Slit experiment

To put an end to our investigation on the nature of light, we are going to take a quick look at one of the most important experiments in the history of physics: the two-slit experiment.

This experiment was first conceived by T. Young in 1801. It was thought to prove that light is a wave. However, at the beginning of the XXth century, with the arrival of Quantum Mechanics, the same experiment revealed that light (in fact, any kind of matter) is neither a particle nor a wave (or perhaps it is both of them at the same time!).

Please, watch the video you will find on this link and afterwards identify its main parts and its conclusion (the following link will help you understand the nature of 'quantum objects') .

5. What is light? A chronology of the concept of light.

Timeline  n.

a. A chronology.

b. A representation or exhibit of key events within a particular historical period, often consisting of illustrative visual material accompanied by written commentary, arranged chronologically.

The preceding lines belong to an English dictionary definition of the term 'timeline'.

Based the following text (An Introduction to Optics) and using any kind of tool you may find suited to your purpose (including web-based timeline software), could you try to create the chronology of the concept of light throughout history?

Perhaps you could proceed as follows:

First, read the text from beginning to end.
Then, look up the words you don't understand using an online dictionary (http://www.wordreference.com/). Read the whole text again.
Afterwards, try to make a (handwritten) sketch of what your timeline should look like.
Finally, use the web-based timeline software you have chosen to create a chronology of the concept of light.

Feel free to enlarge the information given by the text with any events you consider important to understand the history of light. 

(And don't forget to upload your final product to your blog!!!)