前天決定今年好好把 Modern optical engineering 讀完。 (`'(`x#
大概就每天讀個一節。有沒有人要一起讀的? ^jhc(ZW"
Page 7 <<WqL?8W
1.3 Snell's Law of Refraction `s8*n(\h
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light l;7T.2J'Z
as a fraction of the amount that light of a median wavelength is bent. +-2W{lX
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? -qyhg-k6
Δn/(n - 1) 是不是有什麼物理涵意? qzk!'J3*r<
pf% yEz
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