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Chapter 33: Q. 50 (page 957)
FIGURE P33.49 shows the interference pattern on a screen behind a diffraction grating. The wavelength of the light is . How many lines per millimeter does the grating have?
The grating hasof lines per millimetre.
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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?
A helium-neon laser is built with a glass tube of inside diameter , as shown in FIGURE P33.62. One mirror is partially transmitting to allow the laser beam out. An electrical discharge in the tube causes it to glow like a neon light. From an optical perspective, the laser beam is a light wave that diffracts out through a -mm-diameter circular opening.
a. Can a laser beam be perfectly parallel, with no spreading? Why or why not?
b. The angle to the first minimum is called the divergence angle of a laser beam. What is the divergence angle of this laser beam?
c. What is the diameter (in mm) of the laser beam after it travels
d. What is the diameter of the laser beam after it travels ?
You need to use your cell phone, which broadcasts an signal, but you're behind two massive, radio-wave absorbing buildings that have only aspace between them. What is the angular width, in degrees, of the electromagnetic wave after it emerges from between the buildings
One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. Having recently studied optics in your physics class, you're not too surprised to see that the patch of light seems to be a circular diffraction pattern. It appears that the central maximum is about across, and you estimate that the distance from the window shade to the wall is about . Estimate (a) the average wavelength of the sunlight (in ) and (b) the diameter of the pinhole (in ).
Helium atoms emit light at several wavelengths. Light from a helium lamp illuminates a diffraction grating and is observed on a screenbehind the grating. The emission at wavelength creates a first-order bright fringe from the central maximum. What is the wavelength of the bright fringe that is from the central maximum?
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