WVU PHYS 102 - Wave Optics III (2 pages)

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Wave Optics III

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Wave Optics III


Wave optics continued.. Possible Exam Questions

Lecture number:
Lecture Note
West Virginia University
Phys 102 - Introductory Physics
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PHYS 101 1st Edition Lecture 37 Outline of Last Lecture I Wave Optics Continued Outline of Current Lecture II Wave Optics continued Current Lecture II Wave Optics continued A May be on exam A monochromatic light source has a pair of closely spaced slits The target area has three photo detectors A B and C Detectors A and C are in the line of sight of the source and slits with B midway between Which of the following can be stated with certainty i ii iii iv All photons will reach A C None will reach A C Lots of photons will reach B None will reach B Answer iii If photons travelled like bullets they d certainly reach detectors A C but not B But photons travel as waves How many photons reach A C is uncertain What is certain is that lots of photons reach B Why Because B is equidistant from the two slits where constructive interference occurs Final Material New material homework problems Old material tests practice exams Radio waves from a star of wavelength 250 m reach a radio telescope by two separate paths as shown in figure P24 13 One is a direct path to the receiver which is situated on the edge of a cliff by an ocean The second is by reflection off the water The first minimum of destructive interference occurs when the star is 25 0 degrees above the horizon Find the height of the cliff Assume no phase change These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Destructive path difference m Sin 25 h d2 H d2 sin 25 get d2 Path difference 0 250 path difference 125 d2 d1 125 get rid of d1 180 25 90 25 40 degrees sin 40 d1 d2 d2 d2 sin 40 125 d2 1 sin40 125 d2 350 m but h d2 sin 25 350 sin 25 148 m Why do the two headlights of your car not produce fringes They are not coherent meaning they are exactly the same wavelength amplitude starting point fluctuation etc

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