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# Les mirages

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### Les mirages

1. 1. THE MIRAGES
2. 2. Mirage on the road
3. 3. <ul><li>To explain you the phenomene of the mirage , you need fiew simple physical notion . </li></ul><ul><li>So , I’m going to talk you about them . </li></ul>
4. 4. HOW A MIRAGE IS WORKING : (Explication) <ul><li>SCIENTIFIC NOTION YOU NEED TO KNOW: </li></ul><ul><li>Lights rays are waves </li></ul><ul><li>The behaviour of the wave depends of the caracteristique environnement from where it is . </li></ul>
5. 5. <ul><li>As you can see in this glass , there is two different caracteristic’s environnements : one is the air , and an other one is the water . </li></ul><ul><li>When you put a pen into the water , it seems that the pen is broken . </li></ul><ul><li>In fact it is not broken , it’s an illusion . </li></ul>
6. 6. <ul><li>When lights rays crosses diferrent caracteristic’s environnement , the wave diverts . </li></ul><ul><li>It changes its trajectory , its speed , its direction ,… </li></ul><ul><li>I will show you an outline : </li></ul>
7. 7. Reflection ’s phenomene by Snell-Descartes: <ul><li>Ray1 is comming </li></ul><ul><li>Ray2 is divert </li></ul><ul><li>At the interface , the wave is divert </li></ul>
8. 8. <ul><li>The temperature variation modify the caracteristic’s environnement . </li></ul><ul><li>When , the wave crosses this difference , this interface , the direction and the trajectory of the wave change . </li></ul><ul><li>So it means , that the behaviour of the wave is going to change to . </li></ul>
9. 9. <ul><li>Now , we know bit more . </li></ul><ul><li>Let’s come back to the mirage , when you are on the road , when it’s very hot . </li></ul>
10. 10. Scientific explication about the mirage : <ul><li>In the air , the temperature is not constant . </li></ul><ul><li>Sometimes , you can have a difference of temperature of ten degrees beetwin the ground and ten meters higher . </li></ul><ul><li>Like we already saw before , a difference of temperature change the caracteristic’s environnement. </li></ul><ul><li>So , it means a comming ray on this interface will be divert . </li></ul>
11. 11. <ul><li>On the summer day, the sun is heating the road . </li></ul><ul><li>The road is comming hoter than the air above it . </li></ul><ul><li>It create an interface . </li></ul>
12. 12. <ul><li>Ray lights comming from the sky on the road are divert . </li></ul><ul><li>They are changing of direction and trajectory … </li></ul><ul><li>They are comming in our direction . </li></ul>
13. 13. <ul><li>So , what we see , is the reflection of the sky ; that look likes a puddle of water . </li></ul><ul><li>This is a mirage . </li></ul><ul><li>Now , you know , what , you will see . </li></ul>