Interferensi Pada Lapisan Tipis Planparalel

Gbr. Plan Paralel

Sinar datang L menghasilkan warna-warna di atas permukaan lapisan (misal minyak) dengan syarat:

2 nd cos r = (2m -1)1/2 l terang (maks)
(2m)1/2 l gelap (min)

Jika sinar datang tegak lurus permukaan lapisan maka cos r = 1

m = Orde = 1, 2, 3, ……..
l = panjang gelombang cahaya di udara
n= indeks bias lapisan

 

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