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Physical optics   (2)

    Submitted to
Dr. Mohammad Salah

   Prepared by:
 Ghayda’a Shaqour

     2012-2013
 The experiment is named for
 its inventor, Thomas Young
 (1773-1829)



 This experiment strongly
 demonstrates the wave nature
 of light.
 Double slit                   Screen




                 Light beam
Particle                         Wave
 If light acts as a particle,    The light will diffract
  only two slits will appear       and interfere, making
  on the screen                    many fringes
L1
                      Next Maxima


d                     Central Maxima
    θ
                 L2

        Γ
 Light hits two slits separated by 0.05 m. If 25.32
  μm separates the bright fringes on the screen
  that is 2m distant, what is the wavelength of
  light being used?

D sin    =mλ
                                                   m(1)
        25.32                                   25.32 μm
0.05     —=
         2      1   λ   0.05
                        m           2m             m(0)

λ = 633nm
 Light behaves like a wave; interference


 We used this property to calculate the wavelength of
  light

 Light also behaves like a particle


 This behavior is described in the dual wave/particle
  theory
 http://skullsinthestars.com/2009/03/28/optics-basics-
  youngs-double-slit-experiment/
 http://en.wikibooks.org/wiki/High_School_Chemistry
  /The_Dual_Nature_of_Light
 http://bylaketahoe.com/Laboratory%20Experiments.h
  tm#Experiment 1
 http://www.walter-fendt.de/ph14e/doubleslit.htm
Young's double slit experiment

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Young's double slit experiment

  • 1. Physical optics (2) Submitted to Dr. Mohammad Salah Prepared by: Ghayda’a Shaqour 2012-2013
  • 2.  The experiment is named for its inventor, Thomas Young (1773-1829)  This experiment strongly demonstrates the wave nature of light.
  • 3.  Double slit  Screen  Light beam
  • 4.
  • 5. Particle Wave  If light acts as a particle,  The light will diffract only two slits will appear and interfere, making on the screen many fringes
  • 6.
  • 7.
  • 8. L1 Next Maxima d Central Maxima θ L2 Γ
  • 9.  Light hits two slits separated by 0.05 m. If 25.32 μm separates the bright fringes on the screen that is 2m distant, what is the wavelength of light being used? D sin =mλ m(1) 25.32 25.32 μm 0.05 —= 2 1 λ 0.05 m 2m m(0) λ = 633nm
  • 10.  Light behaves like a wave; interference  We used this property to calculate the wavelength of light  Light also behaves like a particle  This behavior is described in the dual wave/particle theory
  • 11.  http://skullsinthestars.com/2009/03/28/optics-basics- youngs-double-slit-experiment/  http://en.wikibooks.org/wiki/High_School_Chemistry /The_Dual_Nature_of_Light  http://bylaketahoe.com/Laboratory%20Experiments.h tm#Experiment 1  http://www.walter-fendt.de/ph14e/doubleslit.htm