chapter24_PC - Chapter 24 Wave Optics Wave Optics The wave...

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    Chapter 24 Wave Optics
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    Wave Optics The wave nature of light is needed to  explain various phenomena Interference Diffraction Polarization The particle nature of light was the  basis for ray (geometric) optics
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    Interference Light waves interfere with each other  much like mechanical waves do All interference associated with light  waves arises when the electromagnetic  fields that constitute the individual  waves combine
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    Conditions for Interference For sustained interference between two  sources of light to be observed, there  are two conditions which must be met The sources must be  coherent They must maintain a constant phase with  respect to each other The waves must have identical  wavelengths
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    Producing Coherent Sources Light from a monochromatic source is allowed  to pass through a narrow slit The light from the single slit is allowed to fall  on a screen containing two narrow slits The first slit is needed to insure the light  comes from a tiny region of the source which  is coherent Old method
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    Producing Coherent Sources,  cont Currently, it is much more common to  use a laser as a coherent source The laser produces an intense,  coherent, monochromatic beam over a  width of several millimeters The laser light can be used to illuminate  multiple slits directly
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    Young’s Double Slit  Experiment Thomas Young first demonstrated  interference in light waves from two sources  in 1801 Light is incident on a screen with a narrow  slit, S o The light waves emerging from this slit arrive  at a second screen that contains two narrow,  parallel slits, S 1  and S 2
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    Young’s Double Slit  Experiment, Diagram The narrow slits, S 1   and S  act as  sources of waves The waves  emerging from the  slits originate from  the same wave front  and therefore are  always in phase
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    Resulting Interference Pattern The light from the two slits form a visible  pattern on a screen The pattern consists of a series of bright and  dark parallel bands called  fringes Constructive interference  occurs where a  bright fringe appears Destructive interference  results in a dark  fringe
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    Fringe Pattern The fringe pattern  formed from a Young’s  Double Slit Experiment  would look like this The bright areas  represent constructive  interference The dark areas  represent destructive  interference
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    Interference Patterns Constructive  interference occurs  at the center point The two waves  travel the same  distance Therefore, they  arrive in phase
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    Interference Patterns, 2
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chapter24_PC - Chapter 24 Wave Optics Wave Optics The wave...

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