# Thin Film Interference and Diffraction

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## Thin Film Interference and Diffraction

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Lecture number:
28
Pages:
2
Type:
Lecture Note
School:
The University of Vermont
Course:
Phys 012 - Elementary Physics
Edition:
1
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Unformatted text preview:

Lecture 28 Outline of Last Lecture I. Double-slit experiment a. When L is much larger than d, you can assume the two light beams (from each slit) are essentially parallel. i. d = distance between slits, L = distance between screens, m = fringe order (central = 0, first = 1, etc.), λ = light wavelength, θ = angle the normal line to the first screen and the light beams, y = vertical displacement of the light beams ii. dsinθ = mλ (for constructive interference) iii. tanθ = y/L iv. y = (mλL)/d II. Diffraction Gratings a. Like double-slit experiment but with many slits. Physics 012 1st Edition

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