File:Why half of photons get through a polarizing filter.webm
Why_half_of_photons_get_through_a_polarizing_filter.webm (WebM audio/video file, VP8/Vorbis, length 40 s, 640 × 480 pixels, 29 kbps overall, file size: 140 KB)
Captions
Captions
Summary
[edit]| Description |
English: Half of photons from an unpolarized light source get through a polarized filter, but why? This video shows one way to understand it: assume photons have *random* polarization orientation. When they reach the filter - in this case oriented vertically, so aligned with 90 degrees and 270 degrees - the probability of passage is given by the square of a sine wave, shown as the solid blue line.
To see why half get through, we select two random numbers. The first random number is between 0 and 360, and is the angle of a single photon's polarization. The second is a number between 0 and 1. If it's less than the probability - lying beneath the blue curve - then the photon gets through the filter; otherwise it does not. I've marked those that get through with green circles, while those that don't are red "x"s. As you can see from the animation, just from those random numbers, about half the photons get through. (This is a process known as "Monte Carlo integration", for those keeping track at home.) |
| Date | |
| Source | YouTube: Why half of photons get through a polarizing filter – View/save archived versions on archive.org and archive.today |
| Author | Matthew Francis |
Licensing
[edit].svg){kind=icon}
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
This file, which was originally posted to YouTube: Why half of photons get through a polarizing filter, was reviewed on 13 February 2020 by the automatic software YouTubeReviewBot, which confirmed that this video was available there under the stated Creative Commons license on that date. This file should not be deleted if the license has changed in the meantime. The Creative Commons license is irrevocable.
The bot only checks for the license, human review is still required to check if the video is a derivative work, has freedom of panorama related issues and other copyright problems that might be present in the video. Visit licensing for more information. If you are a license reviewer, you can review this file by manually appending |
|
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:25, 20 June 2018 | 40 s, 640 × 480 (140 KB) | Vislupus (talk | contribs) | Imported media from https://www.youtube.com/watch?v=dsM7hObyvP0 |
You cannot overwrite this file.
File usage on Commons
The following page uses this file: