Diffraction and Thin Film Interference

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Diffraction and Thin Film Interference


Lecture number:
27
Pages:
3
Type:
Lecture Note
School:
The University of Vermont
Course:
Phys 012 - Elementary Physics
Edition:
1
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Lecture 27 Outline of Last Lecture I. If λ of light is large compared to size of opening that light passes through, we must consider diffraction and interference effects. a. Diffraction i. When light passes through a thin slit it will spread out with curved wave fronts. b. Constructive Interference i. When light waves of equal amplitude and wavelength are completely in- phase, the amplitude of the resulting wave will have an amplitude twice that the individual light waves. c. Destructive Interference i. When light waves of equal amplitude and wavelength are completely out- of-phase, the resulting light wave will have an amplitude of zero (completely dark). d. Laser Double-Slit Experiment i. Experiment: Coherent monochromatic light of wavelength λ is incident upon a screen with two narrow slits. λ is much greater than the width of the slits. A screen is placed a distance L from the screen with slits. ii. Where wave fronts meet, there is constructive interference. Where a wave front of one light beam is directly between two wave fronts of the other light beam, there is destructive interference. Physics 012 1st Edition



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