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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (1)

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Post by NGAWANG TSERING on March 17, 2013

1 as the slit width increased for single slit experiment which one is right answer:
a. the spacing between the central maximum to first minimum increased
b. spacing between the central maximum to first maximum decreased
c, spacing between maxima stayed the same

2 As the wavelength shorten the
a spacing between the central maximum to first minimum increases
b spacing between the central maximum to first minimum decreases
c spacing between the maximum stayed the same

3. As the slit to screen distance L gets bigger the
a spacing between the central maximum to first minimum increases
b spacing between the central maximum to first minimum decreases
c spacing between the maximum stayed the same

For double slit experiment

4 As the slit separation increased the
a spacing between maxima increased
b spacing between maxima decreased
c spacing between maxima stayed same
d the number of maxima in the central region defined by single slit pattern increased
e the number of maxima in the central region of the single slit pattern decreased

5 As the width of individual slits increased the
a spacing between maxima increased
b spacing between maxima decreased
c spacing between maxima stayed same
d the number of maxima in the central region defined by single slit pattern increased
e the number of maxima in the central region of the single slit pattern decreased


6 What happened if blue light is used instead of red light

7 what happened when the light source is moved closer to the double slits
8. what happened when screen is moved farther away
9 the slits are made narrower


please answer if possible

Interference of Light Waves

  • Interference between two sources will be observed if the sources are
    1. Coherent (maintain a constant phase difference)
    2. Monochromatic (both sources have the same single wavelength)
  • To have coherent sources, use a single source with 2 slits.
  • In Young’s double slit experiment, bright and dark fringes are obtained on a screen. The bright fringes result from constructive interference, whereas dark fringes result from destructive interference.
  • Young’s experiment established conclusively the wave nature of light: waves interfere, particles don’t.

Interference of Light Waves

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
    • Condition for Interference
    • Two Light Sources S1, S2
    • Source are Incoherent
    • Uniform Intensity on Screen
    • Source Should be Coherent
    • Source with Single Wavelength
    • Two Slits with One Source
  • Young's Double Slit Experiment 13:33
    • Wave Front Looks Planer
    • Light Propagates Like Waves
  • Constructive and Destructive Interference 22:39
    • Two Slits Separated by d
    • Consider a Point at Center of Screen
    • Path Difference
    • Constructive Interference
    • Destructive Interference
  • Example 43:52
    • Two Slits Separated
    • Screen is 2 ms Away
    • Second Order Maximum
    • First Maximum
  • Extra Example 1: Double Slit Wavelength
  • Extra Example 2: Two Radio Antennas
  • Extra Example 3: Double Slit Thickness