- #1
- 19,538
- 10,276
Where else am I going to keep all my sciencey stuff?DiracPool said:...
Btw, you're not still wearing an 80's fanny pack, are you Om? Lol.
BillTre said:Oh, I forgot, I wanted to better explain this:
Circularly polarized light (the polarization rotates).
Needed for modern digital cameras since there are a lot of internal reflector/refractors to get some of the light to internal sensors for metering etc.
Linearly polarized light will not always make it through all the internal reflectors/refractors making the metering undependable.
The camera can have a linear polarizer (to produce the desired effects, such as reducing light from reflections off the water) with a quarter wave plate behind it (which turns the linearly polarized light into circularly polarized light.
The circularly polarized light gets through the various optical paths within the camera OK.
Let's see if I can clear up the fog.OmCheeto said:I'm guessing now that it was the "circularly polarized" that put my brain in full stop mode.
I can somewhat understand "regular" polarized light, but "circularly"? This implies that light is somehow "spinning".
How the hell do you get light to spin?
This implies that you can apply a torque to photons.
And that's just "crazy talk".
Hence, in my mind; "This 'Bill' guy is talking voodoo science, so I'll just stare at the bricks on the wall, until he finishes..."
ps. And yes, I did go through the wiki article last night: Voodoo science, IMHO.
pps. Ok, yes, I know it's a real phenomenon. But I'll be long dead before I understand how it works.
That's my understanding also.BillTre said:I think the quarter wave plate (a crystal which has different spacing of the atoms (or molecules) in different directions) which is used to change linearly polarized into circularly polarized light causes a phase shift between components of the polarized light wave that are in the different perpendicular planes.
Greg Bernhardt said:
The speakers at the PF Portland Meetup are BillTre, GregBernhardt, OmCheeto, and Janus.
The topic of the meetup is likely to be related to science, given that the speakers are all scientists. However, the specific topic has not been specified and may vary depending on the interests and expertise of the speakers.
No, the meetup is open to anyone interested in science and the topics discussed by the speakers. All are welcome to attend and engage in scientific discussions.
The PF Portland Meetup is free to attend. However, there may be a suggested donation or optional registration fee to help cover the costs of organizing the event.
Yes, the meetup will likely include a Q&A session or other opportunities for attendees to engage with the speakers and ask questions about their work or the topic being discussed.