前天決定今年好好把 Modern optical engineering 讀完。 93]63NY
大概就每天讀個一節。有沒有人要一起讀的? 3Y)&[aj
Page 7 @D;K&:~|N
1.3 Snell's Law of Refraction ]`$6=)_X
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light 9i\RdJv.
as a fraction of the amount that light of a median wavelength is bent. $`|hF[tv
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? 9WG=3!-@
Δn/(n - 1) 是不是有什麼物理涵意? ;\7`G!q
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