前天決定今年好好把 Modern optical engineering 讀完。 +@~e9ZG%a
大概就每天讀個一節。有沒有人要一起讀的? b{;LbHq+G
Page 7 x M{SFF
1.3 Snell's Law of Refraction K;]Dh?
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light 1z_1Hl
as a fraction of the amount that light of a median wavelength is bent. )NO,G
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? ysFp$!9Ux
Δn/(n - 1) 是不是有什麼物理涵意? zpg512\y
*!yA'z<
yUs/lI, Q