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Chapter 33: Q. 5 (page 955)
Light of wavelength illuminates two slits that areapart. FIGURE shows the intensity pattern seen on a screen behind the slits. What is the distance to the screen
The distance to the screen is.
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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?
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
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?
The pinhole camera of FIGURE images distant objects by allowing only a narrow bundle of light rays to pass through the hole and strike the film. If light consisted of particles, you could make the image sharper and sharper (at the expense of getting dimmer and dimmer) by making the aperture smaller and smaller. In practice, diffraction of light by the circular aperture limits the maximum sharpness that can be obtained. Consider two distant points of light, such as two distant streetlights. Each will produce a circular diffraction pattern on the film. The two images can just barely be resolved if the central maximum of one image falls on the first dark fringe of the other image. (This is called Rayleigh鈥檚 criterion, and we will explore its implication for optical instruments in Chapter .)
a. Optimum sharpness of one image occurs when the diameter of the central maximum equals the diameter of the pinhole. What is the optimum hole size for a pinhole camera in which the film is behind the hole? Assume localid="1649089848422" an average value for visible light.
b. For this hole size, what is the angle a (in degrees) between two distant sources that can barely be resolved?
c. What is the distance between two street lights localid="1649089839579" away that can barely be resolved?
Light from a helium-neon laser illuminates a circular aperture. It is noted that the diameter of the central maximum on a screen behind the aperture matches the diameter of the geometric image. What is the aperture's diameter (in mm)?
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