How Does the Inverse Square Law Relate to the Softness of Light for Portraits?

The law of the invers square is only truly valid for point light sources. For photo purposes we are taking about a bare light bulb following the law almost exactly. As soon as you place this lamp in a reflector or cover it with a diffuser, the resulting light fall-off does will not strictly follow this rule. The extreme would be search light that outputs parallel light rays, the spotlight now cast a bright circle of light that remains unchanged in brilliance over extreme distances. Now a broad light source, if it is big enough, will cast light that remains constant in intensity for a considerable distance (it does not obey at all, the law of the inverse square). Thus broads are favored to output soft light. By soft, we mean the shadows cast by the light are about the same intensity as their surrounds

1. Is it possible that light could be faster in a special medium (not vacuum)?

Yes, of course. When light travels from one medium to another, with a different optical density, it changes speed and therefore refracts. If you wanted to speed up light, just put it through a less dense medium.For example, a light beam travelling through water will, once reaching the boundary between water and air, change speed (speed up since air is less dense) and refract (bend) away from the normal to the surface of the water. Speed of light in a vacuum (c) : 2. 99792 x 10^8 m/sSpeed of light in air: 2. 99709 x 10^8 m/sSpeed of light in water: 2.66 x 10^8 m/sBut I am assuming you meant actually speed up light faster than c (speed of light in a vacuum) in which case, nope sorry, no can do.The speed of light in a vacuum is the fastest speed possible with our current understanding of physics. To make light go faster, you would have to find a medium with a lower optical density than a vacuum (which is precisely 1.000).There is nothing that can have a optical density lower than pure vacuum since a vacuum literally contains nothing to impede or "slow down" light as it travels. You can not get more empty than nothing. Plus if you could get this theoretical medium, then you would be breaking the laws of physics (and we can not have that can we?)Besides, the speed of light is in effect 300,000,000 m/s ! Going any faster would just be plain irresponsible. You little speed freak, you. -MK.

2. If the sun disappeared, would it be possible to survive on earth with artificial light sources that try to mimic the sun (all other problems are adequately being handled)?

Not without getting a replacement sun.The sun does much more than provide us with light. It is the single most powerful energy source in the system. It powers everything. Not to mention that if you removed the sun, some 99% of the mass of the system would go with it. There would be nothing to keep the system intact.The bottom line is that it would be literally impossible to find another source of energy equal to the sun. Consider how much material we have on this planet to generate energy. Now consider that ALL of it combined is still far less than .01% of the energy in the entire system.So even if we combined every resource we had, we could not even come close to 1% of the sun's energy

3. What state is light in?

solid, liquid, gas, and plasma are states of matter. light is made of photons, which are just energy (technically so is matter, but its different). energy is not subject to phase changes. "Just say it is matter in a light-speed state, and you do not have the physics to define it yet." no dont say that. matter if a lightspeed state is a physical and mathematical impossibility. think of light as a wavicle. meaning when it is in a vacuum, or not interacting with anything, it acts like a particle. but when it interacts with a particle it acts like a wave. wavicle.

4. what is fiber optic internet?

Fibre optics is a glass fibre stretched so thin it is thinner than a humn hair, these wires are especialy fast because the information traveling through them is at the speed of light, this is how it works; Light signals are sent from the transmitter (the service provider) in etremely short bursts of light over and over again, many times a second, this visible light translates into binary at the other end, a receiver, or, cable modem which gives you internet. Hope this answerd your questions, and glad to be of help :D -jay out

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Could You Answer These Questions for Me?
Could you answer these questions for me?Finally and question I can help someone with =P. Ok, The sky is blue because the molecule water tends to only reflect blue light back into space, since our planet is about 75% water, you can imagine how much blue light is being relected back into space during the daytime. It makes our sky blue. All the other color lights, water absorbs more.(red green yellow orange ect.) Apples are red because the skin of an apple reflects more red light back into space, and it absorbs more af the other colors (blue, yellow orange, green ect.) Im guessing if the apple is placed behind a red filter it would become white. When you turn the volume up the sound wave increases in intensity, which makes the sound wave higher in decibals and I am not sure on this but I think it speeds of the wave's frequency you will have to look that up.— — — — — —Difference between Green and Blue light?Green has More Wavelength than Blue; The Fringe Width in Young Double slit Expt is Directly proportional to wavelength of the color As Green has more wavelength than Blue the fringe width increases— — — — — —I am looking for an emergency blue light?need a permit from your dmv or police dept if your with a volunteer fire dept they can help with that— — — — — —What is the tool called that emits blue light?Light is an electromagnetic wave. You are right in saying that all EM radiation travels at the same speed. Light is just a range in the spectrum of EM radiation. Microwaves, radio waves, cosmic rays are all different frequencies of the same things. But light also behaves as a particle. This was demonstrated in experiments. This caused a lot of confusion among physicists for a long time. In the end, it's now recognized that light (as well as most particles) behave both as waves and as particles. The phenomenon is called Wave-particle duality and it is an important part of quantum physics. Light's speed however CAN be changed. It does so everytime it changes medium. The speed of light (297792458 m/s) is its speed in a vacuum. It slows down when it is in a denser medium (air, water, etc). This is what causes refraction. You can observe refraction when you put a pencil in a glass of water. The pencil looks bent. This is due to the change in speed of light. Light does NOT have mass. This is why it can travel so fast. For complicated reasons (see Einstein's theory of relativity) it would require infinite energy for it to travel at that speed if it had mass. But it IS affected by gravity. Einstein explained this in the same theory. Great mass bends space-time. This is the cause of gravity. Think of a sheet of rubber, streched tightly. If you put a heavy metal ball in the center, it will bend the sheet. If you then put another smaller ball, it will be "drawn" to the big one. As well, if you tried to draw a line, it would be difficult to draw it straight, the tendency would be to have it curve, evn though the line has no mass. That is basically what happens to light. This has been confirmed in observations. Astronomers have seen light being bent around stars. But keep in mind that not all of this is yet resolved. There are some inherent contradictions between the theory of relativity (which explains gravity well) and the quantum theory (which explains the particle-wave behavior of light well) that have not been resolved yet. Wikipedia is a good place to look for more information.— — — — — —What is that blue light that they shine in your mouth when getting fillings at the dentist's office?The blue light is used to cure certain materials. For example the composite materials we use for doing fillings is made up of a lot of really small parts (monomers) and what we really want is for these to link up into chains (polymers). To get this reaction going we "activate" the material by shining blue light (wave length around 480nm if I recall correctly) on it. The materials contain a certain particles, when hit by this wavelength, releases a free radical which in turn starts the formation of the polymer chains
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