A monochromatic light source is incident upon a single slit, as shown in Figure 1.
Figure 1
Bright and dark fringes are produced on the screen.
State what is meant by a monochromatic source and why it is needed to view the fringes on the screen.
After the light passes through the single slit, the double slits then act as coherent sources.
Explain what is meant by the term coherent sources.
Explain how the use of the single slit in Figure 1 means the light is then coherent when it passes through the double slits.
Explain what the bright and dark fringes represent on the screen.
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