ch24_review

# ch24_review - A Manalaysay PHY2054 Fall 2004 CHAPTER 24...

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A. Manalaysay – PHY2054, Fall 2004 CHAPTER 24 Interference: Whenever two or more beams of light hit the same point, they will interfere with each other. Complete Constructive Interference happens when the peaks of the first wave line up with the peaks of the second wave, and the troughs also line up. Complete Destructive Interference occurs when the troughs of one wave line up with the peaks of the other (and they cancel each other out). Double slit interference: Each slit acts as a source of light. At any point on the screen, the light hitting it has traveled to hit it is different depending on which slit it came from. Since the two beams travel different distances, they are not (necessarily) in phase. “Phase” refers to where along its cycle is the wave: peak, trough, or somewhere in between. The distance between one peak and the next is one full wavelength. The distance between a peak and the adjacent trough is half of a wavelength. Bright spots occur where there is constructive interference, where the peaks line up with the peaks. Thus, the bright spots occur where the two paths differ by a whole number of wavelengths: ------ bright spots The dark spots occur where there is destructive interference, where the peaks from one wave line up with the troughs of the other. Thus, the dark spots occur where the two paths differ by a half number of wavelengths (i.e. 1/2, 3/2, 5/2, 7/2, etc.):

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## This note was uploaded on 01/15/2012 for the course PHY 2054 taught by Professor Avery during the Spring '08 term at University of Florida.

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ch24_review - A Manalaysay PHY2054 Fall 2004 CHAPTER 24...

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