Multiple Slit Interference
| Practice 19.4.1 |
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A plane monochromatic light wave is incident on a double slit. As the slit separation increases, what happens to the separation between the interference fringes on the screen? |
| Practice 19.4.2 |
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| Suppose Young’s double-slit experiment is performed in air using red light and then the apparatus is immersed in water. What happens to the interference pattern on the screen? |
| Practice 19.4.3 |
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Coherent monochromatic light of wavelength 632.8 nm passes through a pair of thin parallel slits. The figure shows the central portion of the pattern of bright fringes viewed on a screen 1.40 m beyond the slits. What is the distance between the two slits? |
The images below show the interference pattern formed by two wave sources (located at the red dots) emitting waves of the same wavelength in phase with one another. Looking at the images, what seems to affect the spacing of the interference maxima (light areas) and minima (dark areas)? Describe the differences and similarities between the two images.
You measure θ to be 0.0190° for the first order maximum. What is the wavelength of this light?
How far apart are the slits’ midpoints?
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