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add your enigma( one group / column), don't forget to write your names.
Then  read the others to add your number of stars !

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Eva Bernard, Marina Cros, Perrine Weber

Experiement n°1 :

The students will have a solution of water with 10 grams of salt. With an angle of refraction which is equal to 20°, what is the angle of refraction ? Make the experiment ! The number of the angle of refraction will be the answer and you will have to enter it in the locker...

The students will have multiples answers :

A. 015°

B. 037°

C. 072°

Experiment n°2 :

If we have an angle of incidece correspinding to 30° and an angle of refraction which is equal to 20°, what is the medium n2 in which the light is passing (n1 is air) ?

We know this index of refraction :

- Air → 1.00

- Ice → 1.31

- Water → 1.33

- Plexi → 1.46

- Glass → 1.52

The numbers you have to enter in the locker is the place (in the alphabet) of the third letter of the medium.

For exemple, air = R = the 18th letter in the alphabet = number 018 in the locker.

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A coast-guard team has been called by a tourism boat : they saw someone drowning !

Our heroic coast guards jumped inside their rescue helicopter and turned their projector on.

Once arrived at the drowning area, a lifeguard jumped from the helicopter into the ocean with his rescue buoy to locate the drowning guy.

Help them to find where the helicopter should place itself to light the drowning scene.

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- All your results have to be round up to the tenth
- The angle beetween the helicopter and the big buoy is the code

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https://docs.google.com/document/d/1TvWsmHqYSdSe0qi7jDh09qFEyi69WiQtQlG2ortIpxI/edit?usp=sharing

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These are the links to two google documents, the first of which is the enigma, featuring examples for better understanding, and the second one being the solutions to this enigma

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Euro Enigma Rose Nathan Thibault and Aurélien

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Euro Enigma solutions Rose Nathan Thibault and Aurélien

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Notez 5 pour avoir du chocolat avant 2021

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Notez 5 pour avoir du chocolat avant 2021

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you'll find a diapo and a text document:

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Experiement n°1:

The students will have different equipment on the table:
- a protractor
- a light box
- a prism
We give them this protocol:
- first put the light box on 0°
- then put the prism in the middle of the protractor
- measure the deflected rainbow angle (especially the blue light)
The first number of the angle will be your first number to unlock the locker.

Experiement n°2:

The students will have a light box and a half cylinder in plexiglass.
Their goal? Find the index of refraction of the half cylinder.

They have some data:
- index of refraction of the air: 1
- angle of refraction: 25°
- angle of incidence: 40°

The index of refraction will be the two last numbers to unlock the locker.