± Understanding Two-Source Interference Learning Goal: To understand the assumpt

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± Understanding Two-Source Interference Learning Goal: To understand the assumptions made by the standard two-source interference equations and to be able to use them in a standard problem. For solving two-source interference problems, there exists a standard set of equations that give the conditions for constructive and destructive interference. These equations are usually derived in the context of Young's double slit experiment, though they may actually be applied to a large number of other situations. The underlying assumptions upon which these equations are based are that two sources of coherent, nearly monochromatic light are available, and that their interference pattern is observed at a distance very large in comparison to the separation of the sources. Monochromatic means that the wavelengths of the waves, which determine color for visible light, are nearly identical. Coherent means that the waves are in phase when they leave the two sources. In Young's experiment, these two sources corresponded to the two slits (hence such phenomena are often called two-slit interference). Under these assumptions, the conditions for constructive and destructive interference are as follows: for constructive interference and for destructive interference

Explanation / Answer

Option b will be very close for rays to become parallel to each other and to show all the constructive and destructive reference clearly.

Light from an incandescent bulb shines oto a screen with a single slit; then the light shines onto a screen with two slits in it and light from the two slits finally shines on a far away screne

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