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2012-02-14 15:31 |
relative dispersion
前天決定今年好好把 Modern optical engineering 讀完。 )+.AgqxI
大概就每天讀個一節。有沒有人要一起讀的？ R(2MI}T
Page 7 |[!0ry*N%
1.3 Snell's Law of Refraction w_YY~Af
Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light (CE2]Nv9")
as a fraction of the amount that light of a median wavelength is bent. _X)]/A%@
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? P d(n|t3[8
Δn/(n - 1) 是不是有什麼物理涵意？ Koz0Xy
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