🇨🇴 Una base de datos de cursos en diferentes lenguajes.
🇫🇷 Une base de données de cours dans différents langages.
🇳🇴 En database med kurs på forskjellige språk.
🇺🇸 A flat-file database of courses in multiple languages.
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---title: 'new course : beyond'---
! *YOUR CHALLENGE* : !! *CHALLENGE n°1* : The enigma of the cup of icecream.!! ! ! Why does the volume of the cup seem to be completely filled with ice cream, when it contains so little?!! <details markdown=1>! <summary>! I choose this challenge.! </summary>! Information : the refractive index of the air is $n_1=1$, the one for the cup is $n_2=1.5$. a $R_1$ is the inner radius of the cup, $R_2$ its outer radius.!! _Don’t look at the answer, take some time to think, a few days if necessary. The time to build your mental representation of the phenomenon, to formulate it in words is important, a thousand times more important than the ephemeral moment of reading the few words of the solution._! ! <details markdown=1>! <summary>! CLUE 1 : keywords! </summary>! angle of total reflection.! </details>! <details markdown=1>! <summary>! CLUE 2 : trail! </summary>! The colored ray that reaches the eye of the observer comes from a point of the strawberry ice cream located at the interface with the inner wall of the glass cup.! </details>! <details markdown=1>! <summary>! ANSWER! </summary>! to write! </details>! </details>!! -----------!! *CHALLENGE n°2* : Automatic rain detector!! !! How to detect the rain on a windshield, the detection system being inside the car?!! <details markdown=1>! <summary>! I choose this challenge! </summary>! Information : the refractive indices of air, water and glass of the windshield are respectively $n_ {air} = 1$, $n_ {glass} = 1.5$ and $n_ {water} = 1.33$. The detection system includes a diode light emitter and then a light detector, both attached to the windshield on the inside of the car. The light emitted by the diode propagates in the windshield.!! _Don’t look at the answer, take some time to think, a few days if necessary. The time to build your mental representation of the phenomenon, to formulate it in words is important, a thousand times more important than the ephemeral moment of reading the few words of the solution._!! <details markdown=1>! <summary>! CLUE 1 : keywords! </summary>! total reflection angle! </details>! <details markdown=1>! <summary>! CLUE 2 : trail! </summary>! Both the light emitter and the light receiver are in contact with the windshield inside the car. The refractive interface of the windshield on the outside of the car is a glass-air refracting surface if it does not rain, and a glass-water refracting surface if there is a drop of water.! </details>! <details markdown=1>! <summary>! ANSWER! </summary>! to write! </details>! </details>!! -----------!! *CHALLENGE n°3* : A multi touch screen technology (challenge under construction)!! -----------!! *CHALLENGE n°4* : Luminous fountain (challenge under construction)!
!!!! *DIFFICULT POINT* (contribute, or indicate a difficult point of understanding)!!!!
!! *BEYOND* (to contribute)!!
!! *CULTURAL POINT* (contributor)!!
!!! *DO YOU MASTER ?*!!! <details markdown=1>!!! <Summary>!!! Describe the test!!! </summary>!!! The text of the test (and its images, figures, audio, video, etc ...)!!!!!! Question text!!! <details markdown=1>!!! <summary>!!! Answer choice 1!!! </summary>!!! Text if this answer 1 is chosen!!! </details>!!! <details markdown=1>!!! <summary>!!! Answer choice 2!!! </summary>!!! Text if this answer 2 is chosen!!! </details>!!! <!--possibility to add answers, questions-->!!! -----!!! <details markdown=1>!!! <summary>!!! Complete solution.!!! </summary>!!! text of the solution!!! </details>
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