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27.3 Young's Double Slit Experiment
Light's wavelength is very small compared to the size of the door, so it acts like a ray.
Diffraction is a characteristic of waves.
Diffraction is evidence that a phenomenon is a wave.
The principle was applied to a straight wavefront.
The edges of the wavefront bend after passing through an opening.
Wave characteristics are most noticeable for interactions with objects about the same size as the wavelength, so the amount of bending is more extreme for a small opening.
Christiaan Huygens thought that the light was a wave.
There were other explanations for the color and the interference that were observable at the time.
His view prevailed due to his stature.
The fact that the principle worked was not enough to prove that light is a wave.
The light is diffracted into a pattern on the screen of numerous vertical lines spread out horizontally.
The light would make two lines on the screen without interference.
To show wave effects, light must interact with a small slit used by Young.
Young first passed light from a single source through a single slit to make it more coherent.
The answer is that there are two light sources that interfere with each other.
The effect of sunlight is more difficult to see when each wavelength forms its own pattern.
We show the double slit experiment with light.
The waves add.
Waves crest to crest or trough in pure constructive interference.
Where they are crest to trough is where destructive interference occurs.
To see the pattern, we need the light to fall on a screen.
The wavelength and the distance between the slit determine these angles.
Two sources of waves interfere.
Waves overlap and interfere with each other.
If the light falls onto the screen, we can see it.
The regions of constructive interference and destructive interference have the greatest wave action.
There are different distances from a point on the screen.
The waves arrive in phase at the screen if the paths differ by a whole wavelength.
If the paths taken by the two waves differ by any wavelength.
Look at a light through a narrow gap between two fingers.
Waves follow a path from the slit to the screen.
The waves arrive out of phase.
The waves arrive in phases.
Figure 27.14 shows how to determine the path length difference for waves traveling from two slits to a common point on a screen.
The angle between the path and the line from the slit to the screen is the same for each path.
The figure shows the difference between the paths and the distance between them.
The angle from the original direction of the beam to where the wavelength of the light is is 27.4 It is fourth-order interference.
If the distance to the screen is greater than the distance between the slit, the paths from each slit to a common point on the screen will be different.
A series of bright and dark lines are implied by the equations for double slit interference.
The center of the bright fringes is brighter than either side.
The spreading of the bright fringes can be seen closer to the slit.
This is consistent with our belief that wave effects are most noticeable when the object is small.
Small has a large effect.
An intensity that falls off with angle is the interference pattern for a double slit.
The dark and bright lines are formed by light passing through a double slit.
The third bright line on the screen is formed at an angle of relative to the incident beam, if you pass light from a He-Ne laser through two slit separated by 0.0100mm.
The third bright line is due to third-order constructive interference.
The equation can be used to find the wavelength.
The equation is.
The wavelength of light is three digits.
Neon lights emit a red color.
The fact that interference patterns can be used to measure wavelength is more important.
Young did this for visible light.
The technique is still used to measure the spectrum.
The angle for constructive interference increases with the order in which it is placed.
There is a limit to how big an interference pattern can be.
Constructive interference is described in the equation.
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