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 0 answersPost by NGAWANG TSERING on March 17, 20131 as the slit width increased for single slit experiment which one is right answer:a. the spacing between the central maximum to first minimum increasedb. spacing between the central maximum to first maximum decreasedc, spacing between maxima stayed the same2 As the wavelength shorten the a spacing between the central maximum to first minimum increasesb spacing between the central maximum to first minimum decreasesc spacing between the maximum stayed the same3. As the slit to screen distance L gets bigger thea spacing between the central maximum to first minimum increasesb spacing between the central maximum to first minimum decreasesc spacing between the maximum stayed the sameFor double slit experiment4 As the slit separation increased the a spacing between maxima increasedb spacing between maxima decreasedc spacing between maxima stayed samed the number of maxima in the central region defined by single slit pattern increasede the number of maxima in the central region of the single slit pattern decreased5 As the width of individual slits increased the a spacing between maxima increasedb spacing between maxima decreasedc spacing between maxima stayed samed the number of maxima in the central region defined by single slit pattern increasede the number of maxima in the central region of the single slit pattern decreased6 What happened if blue light is used instead of red light 7 what happened when the light source is moved closer to the double slits8. what happened when screen is moved farther away9 the slits are made narrowerplease 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