前天決定今年好好把 Modern optical engineering 讀完。 .u&X:jOE
大概就每天讀個一節。有沒有人要一起讀的? DS4y@,/)'
Page 7 _M8'~$Sg
1.3 Snell's Law of Refraction voRb>xF
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light "\+\,C
as a fraction of the amount that light of a median wavelength is bent. |AExaO"jk
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? %8DI)n#H
Δn/(n - 1) 是不是有什麼物理涵意? %=K [C
J=kf KQV
L^CB#5uG