He said that the light was monochromatic, so it is just that wavelength and not a spectrum.

^xxovercastxx:

@<a rel="nofollow" href="http://videosift.com/member/Estuffing17" title="member since May 2nd, 2010" class="profilelink">Estuffing17
Actually, because visible green light is at a higher energy level than red light, if an objects energy gap is high enough to let green light through, then red light will also pass through because it has even lower energy levels, not the other way around.
That's exactly what I said in my example.
As far as a translucent green material is concerned, when we perceive an object to have color, it is because that objects atoms are arranged in such a way that it reflects that wavelength of light (green in this case) back to our eye, while either absorbing, refracting or letting pass through photons of other wavelengths. Just because a piece of glass is green does not mean it will not allow other higher and lower energy photons to pass through it.
Green glass, as I understand it, is green because it's filtering out other colors. It's a simplified example, yes. Obviously you can have a little yellow or blue or whatever mixed in and it still looks "green".
But the energy gap explanation seems to mean that "green" glass would be letting all red, orange, and yellow light through since they are lower energy levels. It's one thing to say a little bit of another color is coming through and it's imperceptible. If all the "weaker" colors are coming through along with the green, it doesn't seem to me like it would look very green.

@Estuffing17

Actually, because visible green light is at a higher energy level than red light, if an objects energy gap is high enough to let green light through, then red light will also pass through because it has even lower energy levels, not the other way around.

That's exactly what I said in my example.

As far as a translucent green material is concerned, when we perceive an object to have color, it is because that objects atoms are arranged in such a way that it reflects that wavelength of light (green in this case) back to our eye, while either absorbing, refracting or letting pass through photons of other wavelengths. Just because a piece of glass is green does not mean it will not allow other higher and lower energy photons to pass through it.

Green glass, as I understand it, is green because it's filtering out other colors. It's a simplified example, yes. Obviously you can have a little yellow or blue or whatever mixed in and it still looks "green".

But the energy gap explanation seems to mean that "green" glass would be letting all red, orange, and yellow light through since they are lower energy levels. It's one thing to say a little bit of another color is coming through and it's imperceptible. If all the "weaker" colors are coming through along with the green, it doesn't seem to me like it would look very green.

>> ^BicycleRepairMan:

>> ^xxovercastxx:
This leaves me with another question, unfortunately.
Let's stick with his example of green being high energy and red being low.
The photon only gets through the material if it's not strong enough to excite an electron. This makes sense for a translucent red material. The material's energy gap could be large enough to allow red light through but block all other.
This does not make sense for translucent green material. If the material's energy gap were large enough to allow green light through, it would also allow red light through, resulting in a translucent yellow material. This would seem to allow only red, orange, and then increasingly grey/colorless shades of yellow.
So what's missing from this explanation?

As I understand it(and I'm not sure I understood the question): Red is on a very low enegy level, so if the "energy gap" is large enough to let red pass, green will also pass, which means the light will be moving towards the white end of the spectrum. This means that if you want to make a translucent green material you need materials that absorbs or displace red (such as green plants)



Actually, because visible green light is at a higher energy level than red light, if an objects energy gap is high enough to let green light through, then red light will also pass through because it has even lower energy levels, not the other way around.

As far as a translucent green material is concerned, when we perceive an object to have color, it is because that objects atoms are arranged in such a way that it reflects that wavelength of light (green in this case) back to our eye, while either absorbing, refracting or letting pass through photons of other wavelengths. Just because a piece of glass is green does not mean it will not allow other higher and lower energy photons to pass through it.

I hope this clarifies things for you a bit!

Refractive arcing bullets - coming to an FPS near you.

Wow, great gadget. Wonder if glasses would refract enough of the beams energy to dampen its effectiveness...though I doubt it. I remember some time ago hearing of those beams that tuned into your nervous system and just made your freeze up, like you had a cramp in your whole body; those seem pretty neat as well.

The explosion causes an increase in pressure that propagates outward and is inversely proportional with distance. Something called the index of refraction is increased due to the increase in pressure which bends and slows the light. This causes the "distortion" inside. The area around this is unaltered and thus appears normal.

>> ^burdturgler:
at 5:21 the camera changes angle so you don't see that he is sliding a piece of the glass with his left hand and does the same thing at 6:18 when he slides it back. That's how his hand goes through.


Yeah the camera movements are very fishy. I don't quite understand the hole in the glass, though. Was there a piece of glass that sat very seamlessly on the rest of the glass? It seems like that would be very hard to fit exactly right and have no seam or refraction. Maybe it's coated with an oil on the edge to keep there from being any refraction.

yeah... index of refraction experiments-

I, with a couple of others, used this trick in my zero-g experiment a few years back. We looked at fluid mixing in a granular medium, and used acrylic glass granules and a liquid with a similar refractive index to be able to see what was going on inside the experiment.

>> ^cybrbeast:
Explanation: Glass and glycerin have similar refractive indices. So when light moves from the glycerin through the glass it isn't bent differently, which is the way we normally see transparent glass in water.
http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/indrf.html


There's gonna be a difference though. If you look at it closely enough maybe?

Explanation: Glass and glycerin have similar refractive indices. So when light moves from the glycerin through the glass it isn't bent differently, which is the way we normally see transparent glass in water.

http://hyperphysics.phy-astr.gsu.edu/hbase/Tables/indrf.html

probably something similiar to software used to render physically accurate light reflections and refractions in graphics software, coupled with assigning the 'photons'(sound waves) a speed at which they propagate rather than instantaneous projection
probably relatively useless at the moment but interesting nonetheless

>> ^dvst8download:
It's not refraction as the tags suggest. It's an artifact of CMOS Rolling Shutter, which affects a metric ton of cameras these days, even the $15K Red One. More details than you care to know here: http://dvxuser.com/jason/CMOS-CCD/


Thanks! I adjusted the tags!

It's not refraction as the tags suggest. It's an artifact of CMOS Rolling Shutter, which affects a metric ton of cameras these days, even the $15K Red One. More details than you care to know here: http://dvxuser.com/jason/CMOS-CCD/

Best web explanation (meaning, people giving semi-qualified answers on yahoo answers) suggests the adhesive on the tape fills the tiny gaps in the frosted glass, making the end of the glass smooth, and thus allowing light to exit without being refracted in all directions.

Anyway, I'm definitely trying this at work.