you focus some light (Watt) in a specific area (m2) and get a angle of radiance(sr - steradian). Then if you want at least the same amount of light into a smaller area the angle of radiance must increase. That's the Etendue/optical throughput/optical invariant. However, in the examples I have...
It says you can not change with lenses the value L - radiance. Below I have an example where it proves that you can or where am I wrong? (I made L for 2D case, in 3D case everything the same - L2>L1)
Among other explanations this one gives you an understanding of principle of work. Having read this, you can correct mistakes made in the article by reading other more scientific articles and thus come up with the whole and right picture.
You can watch a lecture on youtube. In there is a simple and good description about fields and charges.
walter lewin
Lec 1 | MIT 8.02 Electricity and Magnetism, Spring 2002
They made the radiation go like it shown on the picture.
I personally think that the redistribution takes place and the pattern remains, but due to the wave divergence and small distances between maximums and minimums the pattern disappears quickly.
I ask that question because I found an article written in 2005 where such experiment was done. The only thing that it was performed with microwaves (3cm) and not the light waves which should not really make any difference. They came to the result that it saves some kind of the pattern even when...
The redistribution of energy takes place during interference. Energy from a place of a destructive interference goes to a place of a constructive interference.
[PLAIN]http://goldberg.lbl.gov/img/interference_pattern.jpg
At these black spots there are no energy since it is redistributed...
Hi,
I'm concerned about one question about light interference.
It's said that light energy is redistributed during interference. That creates pattern. One slit or double slit interference create maximums and minimums on the screen where the interference takes place.
Now imagine a...
I understand that.
My question was about where the charge (electrons) go when C decreases. It should go from the plates to ? where ? - back to the battery (or through it). That what was weird to me at first time. Now I know that batteries allow this.
Well,
I've found some websites which tell that if we apply higher voltage to a battery, then it's going to be recharged. That means that the charge on the plates of the conductor will be reduced by going through the battery, though, I think they use a more complex scheme to make the...
Hi.
I've been studying in details how a microphone works. I've found a type of microphones where capacitor is used to record sound. The idea is simple. Increasing and decreasing the distance between the plates of a capacitor (sound waves) results in the changing capacitance. Being connected...
It's difficult to find a good explanation about transistors, but here a link
<< link deleted by berkeman >>
It's a big article, but it leaves most questions behind once you read it.