A thin film of acetone (n 1.25) is coating a thick glass plate (n 1.50). Plane light waves of variable wavelengths are %3D incident normal to the film. When one views the reflected wave, it is noted that complete destructive interference occurs at 600nm and constructive interference at 700nm. Calculate the thickness of the acetone film? Put: A,=/n

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EERENCE FROM THIN FILMS
Problem 7
A thin film of acetone (n 1.25) is coating a thick glass plate
(n
1.50). Plane light waves of variable wavelengths are
%3D
incident normal to the film. When one views the reflected
wave, it is noted that complete destructive interference
occurs at 600nm and constructive interference at 700nm.
Calculate the thickness of the acetone film?
Put: A,=/n
Thin film
n=1.25
Glass plate
1.50
MIT-MANIPAL
109
Transcribed Image Text:EERENCE FROM THIN FILMS Problem 7 A thin film of acetone (n 1.25) is coating a thick glass plate (n 1.50). Plane light waves of variable wavelengths are %3D incident normal to the film. When one views the reflected wave, it is noted that complete destructive interference occurs at 600nm and constructive interference at 700nm. Calculate the thickness of the acetone film? Put: A,=/n Thin film n=1.25 Glass plate 1.50 MIT-MANIPAL 109
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