納比 發表於 2004-11-24 23:57:38

ｄ　ｗａｖｅ難到

溫極都唔ｘ明 :icon045::icon045:
求救

the surface of a material of refractive index 1.8 is coated with a thin film of liquid of refractive index 1.5 and thickness 200nm. White light falls normally on the thin film.
Which of the following ight wavelengths in air is not reflected from the thin film/

a.400nm
b.450nm
c.600nm
d.750nm
e.800nm

Gray 發表於 2004-11-25 01:09:53

打比ken sir~~ :D

yuren 發表於 2004-11-25 01:25:54

溫極都唔ｘ明 :icon045::icon045:
求救

the surface of a material of refractive index 1.8 is coated with a thin film of liquid of refractive index 1.5 and thickness 200nm. White light falls normally on the thin film.
Which of the following ight wavelengths in air is not reflected from the thin film/

a.400nm
b.450nm
c.600nm
d.750nm
e.800nm
2t = (n + 1/2) / :confused:

yuren 發表於 2004-11-25 01:32:15

a.400 nm

path difference = 2t = (n+ 1/2) /

久違 發表於 2004-11-25 06:09:08

a.400 nm

path difference = 2t = (n+ 1/2) /
:icon090::icon090::icon090:

yuren 發表於 2004-11-25 10:27:16

:icon090::icon090::icon090:
有錯請指教 :icon090::icon090::icon090:
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