Total Posts:2|Showing Posts:1-2
Jump to topic:

New Light Filter

slo1
Posts: 4,354
Add as Friend
Challenge to a Debate
Send a Message
3/31/2014 4:28:52 PM
Posted: 2 years ago
http://www.sciencedaily.com...
Light waves can be defined by three fundamental characteristics: their color (or wavelength), polarization, and direction. While it has long been possible to selectively filter light according to its color or polarization, selectivity based on the direction of propagation has remained elusive. But now, for the first time, researchers have produced a system that allows light of any color to pass through only if it is coming from one specific angle; the technique reflects all light coming from other directions.
slo1
Posts: 4,354
Add as Friend
Challenge to a Debate
Send a Message
3/31/2014 4:32:20 PM
Posted: 2 years ago
I wonder how much ambient light put off from a city could would be blocked if you put this on a telescope or glasses. If you had glasses that filtered by direction, could you actually see the milky way from the city, if there were no lights directly above you?

That would be really cool opening up back yard astronomy in the city again.