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bio website nl.linkedin.com/in/…
location Canada
age 32
visits member for 3 years, 8 months
seen 5 hours ago

May
23
answered Optics of the eye - do we see Fourier transforms?
May
23
comment Optics of the eye - do we see Fourier transforms?
@RonMaimon, I never meant to imply that the lens image is a Fourier transform. It's not my statement and I agree with you that it's wrong. I'll write an answer explaining what I mean.
May
23
comment Optics of the eye - do we see Fourier transforms?
@RonMaimon: what? I think you're confusing classical optics and geometrical optics. Classical optics, the 'opposite' of quantum optics, is optics that can be explained without using photons. Specifically, to explain Fourier-transforming lenses, you need paraxial wave optics, which is firmly in the classical domain.
May
18
comment High school double lens optics question
Great example of how a homework question should be asked. The way your translated question is worded, one could also interpret it to mean that the convex lens is always at 65 cm in both cases. Unfortunately this also leads to 2 unknowns in 1 equation.
May
11
answered Effect of a wavefront deformation on the far-field diffraction pattern of a TEM00
Apr
29
answered What is the difference between Sapphire and BK7?
Apr
22
answered Light refraction and causality
Apr
20
comment Third-order susceptibilities of metals?
Optical frequencies - visible and near infrared (say 500-1000 nm wavelengths.)
Apr
19
asked Third-order susceptibilities of metals?
Apr
12
answered How long do reflections take?
Apr
12
awarded  Citizen Patrol
Apr
11
comment 3d holograms - How are they created?
From 'Things often confused with holograms' on the Wikipedia page linked above: 'In 2010, there was a series of concerts ... which included Hatsune Miku ... performing on stage as a "holographic" character. This effect was actually achieved through a special method of rear projection against a semi-transparent screen.'
Apr
11
comment How can I determine transmission/reflection coefficients for light?
Note that the amplitude coefficients will give you the phase shift in reflection or transmission, and the intensity coefficients won't. So you can go easily from amplitude to intensity, but you can only go from intensity to the modulus of the amplitude.
Apr
10
comment Good algorithm for in-experiment 1-D optimization?
@HelderVelez, I have no desire nor time to create a self-learning system. Just want to hit the top of the curve approximately, preferably within a reasonable number of samples since each measurement takes time.
Apr
10
comment Good algorithm for in-experiment 1-D optimization?
I added a description of the algorithm I have now. I'm still interested in discussions of the best method, perhaps in an engineering journal?
Apr
10
revised Good algorithm for in-experiment 1-D optimization?
added description of slipshod algorithm
Apr
5
comment How much is 1 electron-volt (eV)?
A subatomic particle is much, much lighter than a mosquito. In a back-of-the-envelope calculation, let's say a mosquito is 1.7 grams and a proton is 1.7 $\times 10^{-27}$ kg. So to have the same kinetic energy as a flying mosquito, the proton must be travelling about $10^{12}$ times faster than the mosquito. That's a big deal.
Apr
5
asked Good algorithm for in-experiment 1-D optimization?
Mar
28
answered How does a flat wedge lens work?
Mar
15
comment Can a light beam be used as a wire for telephony?
Two students designed a system like this in a lab course I taught. It only worked one way over a distance of two meters and used cheap components, but it worked by modulating the voltage to a laser diode.