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 Jul 8 comment Light dispersion in water So if I incide light not normally in a big amount of water, will I see dispersion? Shouldn't then I see dispersion by looking at the sun (when it's NOT on top of the sky) from behind the water, for example in the sea? Jul 8 asked Light dispersion in water Jun 16 comment Decomposition of this wave function in eigenfunctions Thank you for your help. That's what I initially thought, but he made some reasoning before calculating, and doing that in the case when the highest value for $\ell$ is, let's say, $10$, doesn't seem very efficient. Jun 16 accepted Decomposition of this wave function in eigenfunctions Jun 16 comment Decomposition of this wave function in eigenfunctions Thank you very much. I give you the correct answer for completeness. Jun 16 revised Decomposition of this wave function in eigenfunctions information about the potential that was necessary Jun 16 asked Decomposition of this wave function in eigenfunctions Jun 13 comment Calculation of magnetic force magnitude from a parmenant magnet What's vertical pull? What units do they give you for that? Can you link the website? Jun 12 comment Effect of slits and a lens Ok, thank you, that: $x=f\sin \theta$ was what I needed, I was using $x$ as a generic variable, meaning angular coordinates: $\mathrm{sinc} ^2(kpd/2)$. Thanks for your help. Jun 12 accepted Effect of slits and a lens Jun 12 comment Effect of slits and a lens Thank you for your answer, specially the third case. So, the lens still compresses the difraction pattern of the $\sin^2 x/x^2$, doesn't it? i understand they're centered at the same point, but is there a way to calculate quantitatively the position of the fringes in the focal plane of the lens? Jun 11 asked Effect of slits and a lens Jun 10 comment Dynamic equation Ok, thank you for your complete answer, you explained it perfectly Jun 10 accepted Dynamic equation Jun 9 revised Dynamic equation added 1 characters in body Jun 9 asked Dynamic equation May 22 comment Frank Hertz experiment and different jumps Thank you for the answer and the article. I'm going to read it. May 22 accepted Frank Hertz experiment and different jumps May 22 revised Frank Hertz experiment and different jumps added 34 characters in body May 22 asked Frank Hertz experiment and different jumps