text-only page produced automatically by LIFT Text Transcoder Skip all navigation and go to page contentSkip top navigation and go to directorate navigationSkip top navigation and go to page navigation
National Science Foundation Home National Science Foundation - Engineering (ENG)
Engineering Education and Centers (EEC)
design element
EEC Home
About EEC
Funding Opportunities
Awards
News
Events
Discoveries
Publications
Career Opportunities
COV 2007 Site
ERC Site
Program Evaluations
See Additional EEC Resources
View EEC Staff
ENG Organizations
Chemical, Bioengineering, Environmental, and Transport Systems (CBET)
Civil, Mechanical and Manufacturing Innovation (CMMI)
Electrical, Communications and Cyber Systems (ECCS)
Engineering Education and Centers (EEC)
Emerging Frontiers in Research and Innovation (EFRI)
Industrial Innovation and Partnerships (IIP)
Proposals and Awards
Proposal and Award Policies and Procedures Guide
  Introduction
Proposal Preparation and Submission
bullet Grant Proposal Guide
  bullet Grants.gov Application Guide
Award and Administration
bullet Award and Administration Guide
Award Conditions
Other Types of Proposals
Merit Review
NSF Outreach
Policy Office
Additional EEC Resources
ERC Website: Description of each ERC and summaries of their achievements.
Other Site Features
Special Reports
Research Overviews
Multimedia Gallery
Classroom Resources
NSF-Wide Investments

Email this pagePrint this page

Press Release 06-127 - Video
Lesson in Light

David Snider describes the light-polarizing filter lesson from his course.
View Video

University of South Florida engineering professor David Snider uses light-polarizing filters to explain fundamental properties of electromagnetic radiation to his students.

Credit: University of South Florida

Back to article

Video Transcript:

We went outdoors and we looked at a section of the sky in which sunlight comes bouncing off of the air molecules  the blue light  and it's un-polarized. And to illustrate the principles of the polarizing filter, we hold the polarizing filter up which just passes about half of the light which is un-polarized. And then we take a second polarization filter and if it's aligned with the first one, nothing happens; but if you turn it 90 degrees, then none of the light that the first filter polarizes gets through the second filter and so it turns black altogether. And so I had the students take away and just use one polarizing filter and see if they could find certain sky directions where they could completely blacken out the sky. And these actually happen when you're observing at 90 degrees to the sun. We tried to show this as well with the camera pointing at that direction and using a single filter.

Related media icon
This video requires the free RealPlayer plug-in

 



Email this pagePrint this page
Back to Top of page