前天決定今年好好把 Modern optical engineering 讀完。 %gEgpJd
大概就每天讀個一節。有沒有人要一起讀的? U# U*^#
Page 7 #83pitcc
1.3 Snell's Law of Refraction 1<;G
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Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light $[V-M\q
as a fraction of the amount that light of a median wavelength is bent. T!Nv
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? z
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Δn/(n - 1) 是不是有什麼物理涵意? 7'.]fs:
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