I asked a question a while ago on how to test the speed of fiber optics. but it is alot of stuff i still dont know like what to measuer the light that comes out the tip of an optic fiber with or tha arcsin formula. so i really need help with that. thank you. I also need help in understanding the formula n=c/v. thanl you.
2007-01-07 13:12:37 · 3 answers · asked by Drama Queen 1 in Science & Mathematics ➔ Physics
The simplest way to measure the angle is just to measure the diameter of the exit beam at a known distance from the end of the fiber. The half-angle of the beam is just arctan(r/d), where r is the radius of the spot on a plane at distance d. The numerical aperture (NA) of the fiber is the sine of this angle. The NA is determined by the difference between the refractive indices of the core and cladding. This applies to step-index multimode fiber. Single-mode and gradient index fibers are somewhat more complicated to quantify.
The index of refraction, n, of a material is the ratio of the speed of light in vacuum, c, to the speed of light in the material, which would appear to be the v in your equation.
2007-01-07 14:41:37 · answer #1 · answered by injanier 7 · 0⤊ 0⤋
i might use sparkling lights furniture - as quickly as I grew up we had actual candles on the actual Christmas tree. people went into the woodland and decrease the wonderful tree they might locate. The tree reducing became carried out interior the morning of Christmas eve.. that they had little snap-on candle holders. i don't be attentive to why I never heard of wood or properties burning. We had 2 white candles burning on each window sills. We consistently had a white Christmas lower back then, now it might desire to not snow until January. Tree embellishes have been made out of paper cutouts and straw figures formed with crimson yarn. lights furniture out, the clean aromatic tree with the candles burning, the straw sheep and angels in a golden glow, every person making a music Christmas carols - oh properly - not something became ever lower back as enthralling as that became for a 5 12 months previous. The sparkling lights furniture take me back to the certainty of those circumstances until now. I extremely have them on the domicile outdoors. each thing is purely too plastic immediately so i don't beautify a lot for Christmas interior. purely a set of candles and clean poinsettia everywhere. No Christmas tree.
2016-12-15 18:23:15 · answer #2 · answered by niang 4 · 0⤊ 0⤋
The fibre optics always follow the total internal refelction principle so the angle made by the light is always 49 degree.
2007-01-07 13:33:42 · answer #3 · answered by Anonymous · 0⤊ 0⤋