The true ultimate nature of light is unknown. It's a mystery. When it is talked about in a way that makes it appear science knows all about light, such as the interpretation that the entire Universe is expanding from what was once a small ball in nothingness based upon red shifts, it does a disservice to readers and it is counterproductive in education since it prevents many from taking up the field to help learn more about it. Nobody knows what light is.
In terms of dim light and vision, this relates to how the body and brain percieve it and how the eye works. The eye dilates in the dark like a camera lense widening to take in more light. When we go from dark to light, or if a bright light it turned on in the dark, our eyes have to adapt quickly and usually we will close our eyes for a minute or squint to block the light until our eyes adjust. We control how much light comes into our eyes.
In some very interesting experiments, a beam of light has been slowed down and stopped, converted into matter and then back into light. To take a look at this work just read about physicist Lene Vestergaarf Hau at Harvard. This is just one page to begin with -
Light is very strange and mysterious...and nobody knows what it really is. To read about the age of The Universe or inflation and expansion and such things one should read in the assumptions and interpretations about something that is actually unknown. It's nice to think that science really knows what it is talking about...but that is not true. The wise reader will keep in mind how much is unknown about light, gravity, the center of The Earth even, and all matter of things. It's all a work in progress, and when people give the idea that it's all figured out I feel this is so unfair, especially to kids, and it retards the progress of knowledge. Not knowing is not only ok, it is the honest truth.
New, bright, creative minds are very much needed in science. Great scienctists look for the next generation to improve, disprove, carry on, stand on top of their work, and to invent new ways of seeing things. Everything is open and on the table in science.
· 8 years ago