前天決定今年好好把 Modern optical engineering 讀完。 ='mqfGRi>
大概就每天讀個一節。有沒有人要一起讀的?
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Page 7 V9MA)If>
1.3 Snell's Law of Refraction Xc@4(Nyp
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light <}e<Zf!
as a fraction of the amount that light of a median wavelength is bent. kAAz|dhL-
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? B
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Δn/(n - 1) 是不是有什麼物理涵意? osnDW
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