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View Full Version : Super-luminal backwards light?



Dr Mordrid
19th May 2006, 06:43
http://www.livescience.com/technology/060518_light_backward.html

http://www.livescience.com/images/060518_light_backnew_02.jpg

Jammrock
19th May 2006, 06:48
It's the Chuck Norris effect!

lowlifecat
19th May 2006, 08:13
very solid 4 *twitch!*s out of 5.

Marshmallowman
19th May 2006, 23:26
light waves and waves in general have some pretty weird behiaviour, but i think in this case there representation of a pulse is a bit misleading.

Think about this.

When a tsunami forms they say it travels at the speed of sound....yet the coast where they hit have ocean levels hit go down hours before they hit....Is the tsunami hitting when the wave "crest" arrives or has already started "hitting" those hours before when the ocean goes out?

Dr Mordrid
19th May 2006, 23:43
A tsunamis backdraw is still just one waves foreward trough. These are multiple impulses.

High_Jumbllama
20th May 2006, 05:19
Could this just be an example of group velocity (http://en.wikipedia.org/wiki/Group_velocity)?

Light itself travels at C but the variations can travel faster.

Marshmallowman
20th May 2006, 07:00
well yes.