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Constructive interference (dark or bright)Bright
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Destructive interference (dark or bright)dark
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True or False: In constructive interference, two waves amplify each other to make a bigger wave.True
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If the path difference is a multiple (1lambda, lambda, 3lambda,..) of wavelength the interference is...Constructive
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If the path difference is an odd multiple of half the wavelength, the interference is...destructive
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The path difference for two waves interfering at a point is 3.5 times the wavelength of the wave. What type of interference is expected to occur?Destructive
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What two things must be valid for there to be interference of light?The sources are coherent, which means that the waves they emit must maintain a constant phase with respect to one another.The waves have identical wavelengths.
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For constructive interference, valid only if phase difference is a result of the path difference:
(with any even multiple of pi) -
1. For destructive interference, valid only if phase difference is the result of path difference:
(w/ odd multiple of pi) -
In general, in order to have constructive interference, the waves must be in phase
( (EVEN MULTIPLE OF PI) -
to have destructive interference, they must be completely out of phase
() (ODD MULTIPLE OF PI). -
What is Huygens’ principle and what does it allow us to understand about light?
a. Huygens’ principle is a statement that all points of a wave front of light in a vacuum or transparent medium may be regarded as new sources of wavelets that expand in every direction . It allows us to understand and describe the wave nature of light and various optical phenomena such as reflection, refraction, interference and diffraction . b. “Each new point on the wave acts like a new source that generates. Spherical waves.” At slits c. The new wave is drawn tangent to the circular wavelets radiating from the point sources on the original wave front. -
. According to Young's Double Slit Experiment, when the path lengths are equal..
The waves are in phase and undergo constructive interference at P -
According to Young’s Double-Slit Experiment, when the pathlengths differ by a wavelength…
The waves are in phase and undergo constructive interference at Q -
According to Young’s Double-Slit Experiment, when the pathlengths differ by half a wavelength…
The waves are 180 degrees out of phase and undergo destructive interference at R. -
What is Young’s double slit experiment and what does it show?Young’s double slit experiment is an experiment that shows light is a wave that can interfere and a particle that can be detected.
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What’s the formula to find the path difference in young’s double slit experiment?
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What's the formula for finding the location of the bright fringes in young's double slit experiment?
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What's the formula for finding the location of the dark fringes in young's double slit experiment?
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What’s the formula for fining the width of each fringe?a. W=change in L /2d
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How to find m=0?a. Central brightest fringe
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In young double slit experiment, L is the...L is the distance from the double slit to the screen where the interference pattern is observed in Young's double slit experiment
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In young double slit experiment, d is the...is the distance between the slits
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Typically, in the double slit experiment, L isMuch greater than d
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To find angular location of the bright and dark fringes...
a. For bright: =mlambda. For dark: =(m+1/2)lambda -
For double-slit experiment, y tells youLocation of fringe from center fringe
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For m=0 for dark fringesIt is the first dark fringe above the central bright fringe
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How do you find the separation between two adjacent dark and bright fringes (assuming they are the same size)a. Lambda(L)/d b.
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1. If the distance between the slits is doubled in Young's experiment, what happens to the width of the central maximum?W=change in L /2d The width is halved. (see formula)
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A Young's double-slit experiment is performed with three different colors of light: red, green, and blue. Rank the colors by the distance between adjacent bright fringes, from smallest to largest.
Red has the longest wavelength and blue the shortest so... Blue green red -
In a double-slit experiment, when the wavelength of the light is increased, the interference pattern
Spreads out. -
If a Young's double slit experiment carried out in air, is repeated in water, what happens to distance between the bright fringes?
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Memorize this formula find distance between fringes? (not on formula sheet)
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Since it is a peak, it is a constructive interference. For constructive interferences, path difference is and m=2 so the answer is two wavelengths
