Double and single slit experiments - parallel light beams?

In summary, the light beams in Fraunhofer diffraction are assumed to be close enough to parallel for practical purposes, but if the screen is close to the slit, Fresnel diffraction occurs instead. Hyperphysics offers more information on this topic.
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The outgoing rays are not exactly parallel. In Fraunhofer diffraction, we assume that they are close enough to parallel that the angle approximations work well enough for practical purposes. This is true if the "viewing screen" is very far from the slit, compared to the width of the slit.

If the screen is "close" to the slit, then the approximation doesn't work and we have Fresnel diffraction. Hyperphysics has some pages about this.
 

Related to Double and single slit experiments - parallel light beams?

1. What is a double and single slit experiment?

A double and single slit experiment is a classic experiment in physics that is used to demonstrate the wave-like nature of light. It involves passing a beam of parallel light through a single or double slit and observing the resulting interference pattern.

2. How does a double and single slit experiment work?

In a single slit experiment, the beam of light is passed through a narrow slit, causing the light to diffract and create a pattern of dark and light bands on a screen. In a double slit experiment, the beam of light is passed through two parallel slits, resulting in an interference pattern of alternating bright and dark bands.

3. What is the purpose of conducting a double and single slit experiment?

The purpose of this experiment is to demonstrate the wave-like nature of light and to observe the phenomenon of interference. It also helps to confirm the principles of diffraction and the behavior of waves.

4. What are some real-world applications of double and single slit experiments?

Double and single slit experiments have many practical applications, such as in the study of optics, diffraction gratings, and the development of technologies such as holography and laser technology.

5. Are there any limitations to double and single slit experiments?

One limitation of these experiments is that they only work with coherent light sources, such as lasers, and cannot be performed with incoherent sources like sunlight. Additionally, the size of the slits used can also affect the results of the experiment.

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