Given any two random tile arrangements in a sliding tile puzzle, is it always possible to find a way to go from one to the other? It's trivial to prove that this isn't true for 2x2 puzzles, but I don't know how to approach the problem for bigger sizes, short of brute forcing it with a computer...
Thanks...
So, if I arrange the lens like this
EYE ------- LENS ------- OBJECT
as when looking through a magnifying glass, the image forms between my eye and the lens and I can see it because there are rays going through my eye.
Have I gotten it right?
What's a "diverging" ray btw...
Homework Statement
Diverging lenses produce a "virtual" image, which can be seen but can't be projected, and converging lenses produce a "real" image which can be projected but not seen.
How come we can see the image produced by a converging lens, which is supposed to be a real image...