前天決定今年好好把 Modern optical engineering 讀完。 D5Z)"~'
大概就每天讀個一節。有沒有人要一起讀的? ?U
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Page 7 b&'YW*W
1.3 Snell's Law of Refraction u(8dsgR
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light MjbgAH-
as a fraction of the amount that light of a median wavelength is bent. G[n;%c~`+
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? &AVX03P
Δn/(n - 1) 是不是有什麼物理涵意? Yy,XKIqU
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