Chromatic aberration explained

 Electromagnetic waves explained at the National School of Applied Geology (ENGA), a higher education institution under the Ministry of National Education and Professional Training of Haiti. We do not yet have a physics lab, but very motivated students are going deep into academic books. In this photo taken by surprise by one of the students last week, I was explaining to them the problem of the chromatic aberration of the lens of a telescope. I had to flip the laptop over to show them off, as the projector was not working well at the time, preferably giving a blurry image on the board.

My teaching experience has made me realize that our young people are so eager to learn science, despite enormous constraints that not all of them can overcome.

Une photo souvenir très récente, la semaine dernière seulement, d'un cours donne à ENGA sur les ondes électromagnétiques, particulièrement ici, l'aberration chromatique, un désavantage majeur de la lentille d'une lunette astronomique.

REFERENCE SUR ABERRATION CHROMATQUE: WIKIPEDIA: 

Une aberration chromatique est une aberration optique qui produit différentes mises au point en fonction de la longueur d'onde. On observe alors une image floue et aux contours irisés. Elle résulte de la décomposition de la lumière blanche en plusieurs bandes de couleurs.