Concave Lenses

[mlatti2]

@froggynaan you're right on the semantics comment

you must remember, he even admitted on Colbert he gets a lot of his info from Wikipedia. he got the necessary points across, however.

[yaya1yuyu2]

lol that face looks japanese :)

[FerretDude41]

yay

[froggynaan]

This is purely a semantic comment: I've been taught to call the bending of rays through an optical medium is called refraction, not diffraction. As I understand it, diffraction is the ordered scattering of rays passing through a very small opening.

[ijoe72]

very nice video and thanks

[CBAtheBboy]

don't use white backgrounds! black makes it easier to watch for my eyes...too much white is too bright..then I have to put on my glasses :P

[Adaeze611]

A white background would drive me nuts. Keep it black puhleez!

[WeAreStarStuff51]

@Adaeze611 I agree, white would so annoying. The black background is the best.

[ny1t]

See QED by Richard Feynman

[mohinder3333]

you should really get a white background. black is soo depressing and makes me not wanna watch your videos

[freydawg56]

@mohinder3333

If you use Windows:

find your on screen Magnifier. It is usually under Accessories -> Then Ease of Access. Then find Magnifier. Once it is open, go to Commands, and click INVERT

or Ctrl - 0

Now Invert Everything. The black background is kind of Sal's thing. It is better compared to the white boards in the class room.

[metaldrummerdude777]

@mohinder3333 it has to do with the colors....but i agree lol

[Rawrishable]

Thanks for doing these!