According to Physics Beyond 2000
p/s: From wikepedia, refractive index is proportional to wave speed
The refractive index, n, of a medium is defined as the ratio of the velocity, c, of a wave phenomenon such as light or sound in a reference medium to the phase velocity, vp in the medium itself:
http://upload.wikimedia.org/math/1/e/b/1ebe2a83bffa5fdae44c4befdb7ae082.png physics真係深,,(汗 花花YU爺實岩架 大師兄黎架
一係我換過一個講法比你聽
咁唔同介質光速都有唔同
例如 玻璃出空氣 係咪會快左先
咁你當佢好似架車咁 你當條光線有粗幼啦
我計佢偏左45度射出 咁係咪好似架車 左碌出先 右碌後出
咁一出左去就會快左呀ma 咁所以左邊行得快過右邊 就會轉左啦!!!
e個就係最基本原理你記得佢係咁 之後背返yu爺比你ge proof就可以架啦 本帖最後由 【YU】 於 14-10-2009 18:10 編輯
我唔係實啱既,不過textbook照dup出黎,無咁易錯je.
車輪解法只可以解釋點折法,至於數學上證明 n1sin$1 = n2sin$2 ,就要用上面堆野. 花花YU爺實岩架 大師兄黎架
一係我換過一個講法比你聽
咁唔同介質光速都有唔同
例如 玻璃出空氣 係咪會快左先
咁你當佢好似架車咁 你當條光線有粗幼啦
我計佢偏左45度射出 咁係咪好似架車 左碌出先 右 ...
adamsteve 發表於 14-10-2009 00:53 http://www4.nakuz.com/bbs/images/common/back.gif喔0,0" 我都覺..
我對理科完全唔理解-,-" 本帖最後由 eddypoon 於 12-11-2009 14:10 編輯
A wave is travelling from region 1 to region 2
Let A be the point which first undergoes refraction,
B the point last,
Assume that the time taken for B to undergo refraction after A is t, v1 the velocity of the wave in region 1, v2 in region 2.
BB' = v1 * t
AA' = v2 * t
BB' / sin(a1) = B'A = AA' / sin (a2)
i.e v1 * t / sin(a1) = v2 * t / sin (a2)
Simplifying, v1 / v2 = sin (a1) / sin (a2)
For constant frequency f, using v = f入
入1/ 入2 = v1 / v2 = sin (a1) / sin (a2)
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