前天決定今年好好把 Modern optical engineering 讀完。 +o6"Z)
大概就每天讀個一節。有沒有人要一起讀的? Wh?3vZ^
Page 7 `g'9)Xf4KT
1.3 Snell's Law of Refraction 2reQd47
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light cS|W&IH1
as a fraction of the amount that light of a median wavelength is bent. R5cpmCs@R
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? U)S!@2(4
Δn/(n - 1) 是不是有什麼物理涵意? Ap(>mUs!i
covK6SH
%vWh1-