前天決定今年好好把 Modern optical engineering 讀完。 T)! }Wvv
大概就每天讀個一節。有沒有人要一起讀的? 'm`O34h
Page 7 '.Y,VJaL
1.3 Snell's Law of Refraction uN%Cc12
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light x"2p5T7*>
as a fraction of the amount that light of a median wavelength is bent. :\;9y3
這一段看不是很懂。有沒有人可以說一下為何要這樣定義?而不直接用 Δn 就好?或是用Δn/Δλ? I-#!mFl
Δn/(n - 1) 是不是有什麼物理涵意? L ]')=J+
DsdM:u*s
5 {! fa