Register to reply

Why do red color attenuate in water the most and in air the least?

Share this thread:
vishnumanu
#1
Nov14-12, 11:30 PM
P: 9
Hi, I am currently doing a project in underwater image enhancement. Just now i got this little question that came to my head. I know it sounds silly.
You could notice the red color of sun at sunset, this is due to light scattering and red is least scattered as compared to blue.
On the other hand, in water red scatters first whereas blue scatters the least. Why?
Whats the difference between air and water for this complete change of nature of scattering...?
Phys.Org News Partner Physics news on Phys.org
New study refines biological evolution model
Fiber optic light pipes in the retina do much more than simple image transfer
Production phase for LSST camera sensors nears
vishnumanu
#2
Nov15-12, 01:39 AM
P: 9
hi folks, i think this is connected with something about refractive index about air and water. But i still dont get any correct answer for this.. Please do reply rather than viewing this.
DrDu
#3
Nov15-12, 01:41 AM
Sci Advisor
P: 3,549
Are you refering to the blue color of thick sheets of water? It is due to red being preferentially absorbed, not to scattering.

Drakkith
#4
Nov15-12, 02:14 AM
Mentor
Drakkith's Avatar
P: 11,478
Why do red color attenuate in water the most and in air the least?

See here: http://en.wikipedia.org/wiki/Electro...Visible_region
And here: http://www.opticsinfobase.org/view_a...bile%3Dno&org=
vishnumanu
#5
Nov15-12, 02:41 AM
P: 9
Thanks .. Although i didnt understand them completely, i think water has a special property which is explained by that graph...Right?
vishnumanu
#6
Nov15-12, 02:43 AM
P: 9
Quote Quote by DrDu View Post
Are you refering to the blue color of thick sheets of water? It is due to red being preferentially absorbed, not to scattering.
Is it something related to energy difference between different color spectrum? like the blue light has lesser energy than the red one...
DrDu
#7
Nov15-12, 03:24 AM
Sci Advisor
P: 3,549
Wikipedia has an answer:
http://en.wikipedia.org/wiki/Color_of_water
http://en.wikipedia.org/wiki/Electro...ption_by_water
Apparently the blue colour of water is due to absorptions by overtones of the vibrational excitations of the water molecules.


Register to reply

Related Discussions
KI solution color change in tap water. Chemistry 1
Questions about the gluons, their color and anti-color charges and charge of quarks High Energy, Nuclear, Particle Physics 15
Mathematica PlotStyle->{color,color,color} not working Math & Science Software 3
How to attenuate an already amplified output? Electrical Engineering 3
Why dont we see color red as blue in water? General Physics 7