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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。 (=de#wh2] 大概就每天讀個一節。有沒有人要一起讀的? +xGz~~iNh Page 7 0qdgt 1.3 Snell's Law of Refraction Td|x~mZv: Relative dispersion is given by Δn/(n - 1) and, in effect, expresses the 「spread」 of the colors of light Gd=l{~ as a fraction of the amount that light of a median wavelength is bent. ;R#:? r;t 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? Z,x9 { Δn/(n - 1) 是不是有什麼物理涵意? "M`ehgCBr |izf|*e orU++,S4Pm
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