前天決定今年好好把 Modern optical engineering 讀完。 \w@ "`!%
大概就每天讀個一節。有沒有人要一起讀的？ IaR D"oCH
Page 7 CF@j]I@{
1.3 Snell's Law of Refraction fUS1`
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light _2S(
*
as a fraction of the amount that light of a median wavelength is bent. *Ag,/Cm]
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? fnU;DS] W
Δn/(n - 1) 是不是有什麼物理涵意？ (wZ/I( 4
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