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Instant Sun
1.) why do the radiation coming from the sun coming in parallel rays?
2.) Why each spherical object in the solar system is almost exactly half covered by the light at any given instant?
3.) Explain why the terminator (the line between daylight and darkness) is so sharp?
To the guy who thinks of light as ripples in a pond. light is an electromagnetic wave made up of two perpendicular wave components (the could be considered x and y) that propogates along an axis(z).... if light traveled outward in all directions, no object would be opaque. light would be absorbed and re-emitted in all directions by each and every atom until it had passed through the object. furthermore, a single photon could span vast reaches of space. all optical equipment known to man(including our own eyes) would be unable to distinguise the direction of the source of any photon. This is simply not true.(and i've only brought up a few of the many many problems that would be caused if light acted as a ripple)
now, to answer your question.
the ratio of the distance between the earth and the sun, and the diameter of the sign(the maximum distance between two photons emitted from the sun that could reach earth) is so large that the lines apear parallel.
an object is almost exactly half covered by light because geometrically half of the spherical object can be "seen" from the sun. you could imagine the planets in 2 dimensions as circles with a frount and a back. only one side can be facing the sun (and thus, able to be reached by light) at once.
the terminator is so thin because the "grey area" caused by and diffraction, reflection is relatively small compared to the area that is fully lit or fully dark.
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Can I put sun-in in my blonde highlights to get them lighter?
Can I put sun-in in my blonde highlights to get them lighter?
Will it really make it light? should i do it? Is the change instant?
I used sun-in a few years ago when i had medium brown hair. i sprayed it on in the morning and went to school and kids would tell me that my hair was getting lighter instantly! i used a little bit every couple of days and the change was definitely noticeable. my hair got much lighter. BUT.. eventually it stopped working its magic and my hair was getting a little orange, ok... a lot orange. haha. so i'd just go to your stylist and lighten up those highlights the better way!
