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 Jun 2 revised Covering centeremost slit of a N slit diffraction grating - what happens? not all guys here May 17 answered What is light localisation? Apr 27 answered Spatial and Temporal Coherence Mar 15 answered Is every ordinary coloured transparent paper an optical filter? Mar 13 comment Getting nonphysical results when solving for the index of refraction of a slab? I was giving you long conjectures in the comments and finally I decided to stop conjecturing and make a real answer out of it ;-) Mar 13 answered Getting nonphysical results when solving for the index of refraction of a slab? Mar 12 comment Getting nonphysical results when solving for the index of refraction of a slab? What @SteveB says: It would not be at all surprising for this kind of data to be systematically shifted up or down a bit compared to reality. This has happened to me many times. Mar 11 comment Getting nonphysical results when solving for the index of refraction of a slab? How did you normalize your R and T measurements? Out of curiosity, what happens with the computed n if you add an offset of 0.2 to either? Mar 5 comment Optics - Faraday Rotator using waveplates You can't. Waveplates are reversible, a Faraday rotator is not. Feb 13 answered Clear vs black in terms of light reflection? Dec 13 comment Why is the decibel scale logarithmic? That's incorrect, the decibel scale is logarithmic: +10 dB gives 10x the sound pressure (and +3 dB gives about 2x, as you say) so +20 dB (100-80) gives 100x. In other words, $2^{(100-80)/3} \approx 100$. Dec 12 comment Exciting Surface Plasmon-Polaritons with Grating Coupling Take $\theta_o = \pi/2$, so the grating equation becomes $d(\sin\theta+1)=\nu\lambda$. Then $k=2\pi/\lambda$, and $g=2\pi/d$. The difference between $k$ and $\beta$ is because $\lambda$ is different for the surface plasmon. Dec 4 answered Exciting Surface Plasmon-Polaritons with Grating Coupling Nov 13 awarded Popular Question Nov 2 awarded Yearling Sep 28 comment Law of reversibility of light and total internal reflection Time-reversal symmetry still holds over a boundary between media (though not if the media are lossy.) In the general case you would get four beams, yes, but if you reverse the reflected and transmitted beams and they come together again with the appropriate relative phase difference that they had in the forward case, then they will destructively interfere in the pathway of the fourth beam, and all the energy ends up in the original beam. Aug 1 comment Vibrations after polarization of light They don't oscillate in a single plane. The electric field oscillates in a plane, and the magnetic field oscillates in a plane perpendicular to the electric field. The plane of polarized light refers to the plane in which the electric field oscillates, not the magnetic field. Jul 27 comment Vibrations after polarization of light In a plane wave, the electric and magnetic fields always both oscillate, and they always both oscillate perpendicular to each other. Jul 27 answered Vibrations after polarization of light Jul 18 awarded Custodian