interference
<ul><li>Conditions for interference </li></ul><ul><li>Sound waves </li></ul><ul><li>Light waves </li></ul><ul><li>Young’s ...
Conditions for interference <ul><li>All waves exhibit interference  </li></ul><ul><li>Constrictive </li></ul><ul><li>Destr...
Sound waves
<ul><li>Sound waves leave speakers in phase </li></ul><ul><li>Relative phase along XY depends on distance travelled </li><...
Light waves <ul><li>V. rare to observe light interfering to produce dark region </li></ul><ul><li>Usually random polarisat...
 
 
<ul><li>Light bands = maxima – due to constrictive interference </li></ul><ul><li>i.e. path difference = n  </li></ul><ul...
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Interference

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  • Light and its nature have caused a lot of ink to flow during these last decades. Its dual behavior is partly explained by (1)Double-slit experiment of Thomas Young - who represents the photon’s motion as a wave - and also by (2)the Photoelectric effect in which the photon is considered as a particle. A Revolution: SALEH THEORY solves this ambiguity and this difficulty presenting a three-dimensional trajectory for the photon's motion and a new formula to calculate its energy. More information on : https://youtu.be/mLtpARXuMbM
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Interference

  1. 1. interference
  2. 2. <ul><li>Conditions for interference </li></ul><ul><li>Sound waves </li></ul><ul><li>Light waves </li></ul><ul><li>Young’s double slit experiment </li></ul>
  3. 3. Conditions for interference <ul><li>All waves exhibit interference </li></ul><ul><li>Constrictive </li></ul><ul><li>Destructive </li></ul><ul><li>For Interference: </li></ul><ul><ul><li>The sources must be coherent. </li></ul></ul><ul><ul><li>The sources should be monochromatic </li></ul></ul>
  4. 4. Sound waves
  5. 5. <ul><li>Sound waves leave speakers in phase </li></ul><ul><li>Relative phase along XY depends on distance travelled </li></ul><ul><li>Maximum if path difference = n  </li></ul><ul><li>Minimum if path difference = (n + ½)  </li></ul>
  6. 6. Light waves <ul><li>V. rare to observe light interfering to produce dark region </li></ul><ul><li>Usually random polarisation and phase </li></ul><ul><li>Hence no steady interference pattern </li></ul><ul><li>1801: Young produced double slit experiment </li></ul>
  7. 9. <ul><li>Light bands = maxima – due to constrictive interference </li></ul><ul><li>i.e. path difference = n  </li></ul><ul><li>Distance between maxima, w depends on: </li></ul><ul><ul><ul><ul><li>Slit separation, s </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Wavelength of light,  </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Distance, D between slits and screen </li></ul></ul></ul></ul><ul><li>  = ws </li></ul><ul><li> D </li></ul>

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