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Chapter 33: Q. 21 (page 955)
Light from a helium-neon laser () is incident on a single slit. What is the largest slit width for which there are no minima in the diffraction pattern?
The largest width forin the diffraction pattern
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A helium-neon laser illuminates a diffraction grating. The distance between the two bright fringes is on a screen behind the grating. What is the spacing between slits of the grating
A double-slit experiment is set up using a helium-neon laser . Then a very thin piece of glass is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been the dark fringe. How thick is the glass?
Scientists use laser range-finding to measure the distance to the moon with great accuracy. A brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. A laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. In order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than in diameter. Staying within this diameter is accomplished by using a special large diameter laser. If , what is the minimum diameter of the circular opening from which the laser beam emerges? The earth-moon distance is
Your artist friend is designing an exhibit inspired by circular-aperture diffraction. A pinhole in a red zone is going to be illuminated with a red laser beam of wavelength , while a pinhole in a violet zone is going to be illuminated with a violet laser beam of wavelength . She wants all the diffraction patterns seen on a distant screen to have the same size. For this to work, what must be the ratio of the red pinhole鈥檚 diameter to that of the violet pinhole?
Light of wavelength passes though two slits separated by and is observed on a screen behind the slits. The location of the central maximum is marked on the screen and labeled
a. At what distance, on either side of , are the bright fringes?
b. A very thin piece of glass is then placed in one slit. Because light travels slower in glass than in air, the wave passing through the glass is delayed by in comparison to the wave going through the other slit. What fraction of the period of the light wave is this delay?
c. With the glass in place, what is the phase difference between the two waves as they leave the slits?
d. The glass causes the interference fringe pattern on the screen to shift sideways. Which way does the central maximum move (toward or away from the slit with the glass) and by how far?
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