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🇨🇴 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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courses/01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-ele.../01.plane-refracting-surface/03.plane-refracting-surface.../annex.en.md

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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? ! !

! ! I choose this challenge. ! ! 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. ! !
! ! CLUE 1 : keywords ! ! angle of total reflection. !
!
! ! CLUE 2 : trail ! ! 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. !
!
! ! ANSWER ! ! to write !
!
! ! ----------- ! ! CHALLENGE n°2 : Automatic rain detector ! ! ! ! How to detect the rain on a windshield, the detection system being inside the car? ! !
! ! I choose this challenge ! ! 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._ ! !
! ! CLUE 1 : keywords ! ! total reflection angle !
!
! ! CLUE 2 : trail ! ! 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. !
!
! ! ANSWER ! ! to write !
!
! ! ----------- ! ! *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 ? !!!

!!! !!! Describe the test !!! !!! The text of the test (and its images, figures, audio, video, etc ...) !!! !!! Question text !!!
!!! !!! Answer choice 1 !!! !!! Text if this answer 1 is chosen !!!
!!!
!!! !!! Answer choice 2 !!! !!! Text if this answer 2 is chosen !!!
!!! !!! ----- !!!
!!! !!! Complete solution. !!! !!! text of the solution !!!