light polarization
DESCRIPTION
Light Polarization. These three are the same…. Light pure energy Electromagnetic Waves energy-carrying waves emitted by vibrating electrons Photons particles of light. Polarization Light: Waves in only one direction Not polarized light: waves in random scatter. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/1.jpg)
Light Polarization
![Page 2: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/2.jpg)
These three are the same…
• Light *pure energy
• Electromagnetic Waves*energy-carrying waves emitted
by vibrating electrons• Photons
*particles of light
![Page 3: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/3.jpg)
![Page 4: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/4.jpg)
![Page 5: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/5.jpg)
Polarization Light:
Waves in only one direction
Not polarized light:
waves in random scatter
![Page 6: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/6.jpg)
Blue sky has some glare or polarization
![Page 7: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/7.jpg)
![Page 8: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/8.jpg)
How do we make Polarized Light?
![Page 9: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/9.jpg)
Light Polarization
Parallel, crossed, 45 degrees(100%, 0%, 70%)
Each Polaroid pick only 1 direction of light
![Page 10: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/10.jpg)
What is crossed?
• Two polaroid filters at 90 degrees to another• No light gets through• First vertical filter blocks horizontally polarized light• Second horizontal filter blocks remaining vertical light
![Page 11: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/11.jpg)
How do we make Polarized Light?I. Polarizers- Polarizers are made of long
chained molecules which absorblight with electric fields perpendicular to the axis.
![Page 12: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/12.jpg)
How do we make Polarized Light?II. Reflections off non-metals
![Page 13: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/13.jpg)
How do we make Polarized Light?III. Refraction-
-light bending
-some calcite minerals
![Page 14: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/14.jpg)
How do we make Polarized Light?II. Reflections off non-metals
![Page 15: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/15.jpg)
What happened to that blue sky?
![Page 16: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/16.jpg)
Less and less b lue
![Page 17: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/17.jpg)
No blue left if look long ways across sky like at sunrise and sunset
![Page 18: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/18.jpg)
Space=dark=no air to scatter light
![Page 19: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/19.jpg)
Polarized sunglasses
Most road glare is horizontally polarized
![Page 20: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/20.jpg)
Polarized 3-d glasses
(weaker effect if use different colors/prisms)
![Page 21: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/21.jpg)
Check your understanding
• Suppose that light passes through two Polaroid filters whose polarization axes are parallel to each other. How does the final light compare to the original?A. 100% of original
• B. ½ light• C. ¼ light
D. no light
![Page 22: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/22.jpg)
Check your understanding
• Light becomes partially polarized as it reflects off nonmetallic surfaces such as glass, water, or a road surface. The polarized light consists of waves vibrating in a plane that is ____________ (parallel, perpendicular) to the reflecting surface.
A. Parallel b. perpendicular
![Page 23: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/23.jpg)
Check your understanding
• Which sunglasses work best for glare
• A. both vertically polarizedb. both horizontally polarized
• C. one side of each• D. dark shades unpolarized
![Page 24: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/24.jpg)
Demos:
projector lightcorn syrup
plastic rulerscotch tape
polaroid filmscell phone display
glare on windows/clockcomputer screen
![Page 25: Light Polarization](https://reader035.vdocuments.site/reader035/viewer/2022062218/56816059550346895dcf838c/html5/thumbnails/25.jpg)