前天決定今年好好把 Modern optical engineering 讀完。 hnfrnYH
大概就每天讀個一節。有沒有人要一起讀的? bQ:3G;
Page 7 #dn%KMo2r
1.3 Snell's Law of Refraction vCH v
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light ;wYwiSVd
as a fraction of the amount that light of a median wavelength is bent. 5GWM
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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? A5>gLhl7
Δn/(n - 1) 是不是有什麼物理涵意? uvK%d\d
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