How does light travel thru eye to the brain (physics)?

Question

This is a physics related questioan. I could only find what happen to the light when it travels thru the eye. my questioan is how does the nerve impulse propagates to the brain in a physics way.I only could find the biology term of it. It's a presantation in my class and it 5% of my total course mark. Could anyone just leave some webpage or anything that icould use. I don't want my presantation to be to complicated a simple but good information would be nice. Thank you very much.

Answer 1

I m not quiet sure but then also i will help,
when light travels and it make contact with eye the retina get's the pulse imean light pulse the retina then send the pulse od simply data to brain (a pic) of what it had seen

Answer 2

I don't know if this is the same thing, but when I close my eyes I can always "see" a black tunnel with a light at the end. Sometimes the tunnel is red like burning coals. When it's the black one I've seen into the light and all it is is like this weird combination of space and sky. It looks like cloudy sky on a very dark night. Once you get into the light you see that there is a mixture of darkness and light clouds. The light is a cloud that blocks the image of God b/c we would like die if we saw it or something. Some prophets in the bible talk about seeing God in the darkness and clouds or that he dwells in darkness and clouds. I found that out AFTER I had these visions that I figured must be looking into heaven. But perhaps I am supposed to be able to go into this sky/space and then choose anywhere in the world/universe to go to next from there? Sometimes it is less like a tunnel and more like a cave or a hole in the ground. When I'm in there I see a cage door at the end. Sometimes these creatures open it and look down into the hole. I think it's like the Matrix. We are really being kept in these caves and tunnels and our reality is made up to trick us from knowing we are prisoners.

Answer 3

This is not really a physics question. It is a chemistry and biology question. I suppose everything is physics from someones point of view. This describes nerve impulse propagation. The process is complex and hard to understand.
http://en.wikipedia.org/wiki/Nerve_signal

"When the membrane of an excitable cell becomes depolarized beyond a threshold, the cell undergoes an action potential (it "fires"), often called a "spike" (see Threshold and initiation).

An action potential is a rapid change of the polarity of the voltage from negative to positive and then vice versa, the entire cycle lasting on the order of milliseconds. Each cycle — and therefore each action potential — has a rising phase, a falling phase, and finally an undershoot (see Phases). In specialized muscle cells of the heart, such as cardiac pacemaker cells, a plateau phase of intermediate voltage may precede the falling phase, extending the action potential duration into hundreds of milliseconds."

Answer 4

Light travels to cornea the outermost convex transparent layer of the the eye. It gets converged to send a narrow beam to the lens. The lens still converges the light rays to become a narrower beam. The beam covering a wide field impinges on retina , the disc shaped expansion of the optic nerve.. Receptors on retina divide the colours among themselves.. Both eyes working in coordination give a stereo image on the optic nerves. Both optic nerves carry these differentiated impulses along them and end in optic cortex of the brain to be processed " digitally" by the brain. . Brain explains it to mind . This process is not fully understood.

Answer 5

it doesnt travel to the brain. the light energy (in frequencies) is absorbed by the pigment in the back of your retina, which forms a sort of "retinal map" of what you are looking at. this information is then relayed through your optic nerve out to the optic radiations and into varios regions of the brain. it is now generally considered fact that there is a sort of parallel processing going on: the eye is not a camera and vision is not an image. its more like your eye takes in the physical information and as that information travels to your brain it is broken down into different catagories color, shape, movement etc. and then your perception of reality is more or less recreated from this information.