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Les mirages

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Transcript

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