Lecture vs Lab

Student:     Professor, there is something wrong with this lens.  I cannot find the image.

Instructor:     Is it a converging or diverging lens?

Student:     Diverging.

Instructor:     So, should you see the image formed on the screen?

Student:     I dunno...

Instructor:     Well, it was shown in my presentation 5 minutes ago.

Student:     I saw it, but I didn't think it was for real!

Sunburst

The diffraction of light causes an interesting effect in photography.  The light waves bend on the camera lens and interfere causing lighter and darker spots.  These lighter and darker spots form patterns of lines like the one visible in the picture above.  Nice.  A friend of mine made that picture in Italy, at the Tyrrhenian Sea.

Flying Teabag

Project by Yara

Rolling Uphill

Presented by Emir

Forces on an incline