For a Plane Wave Approaching an Obstacle with a Rectangular

question 13

Multiple Choice

For a plane wave approaching an obstacle with a rectangular opening,diffraction becomes important in which of the following circumstances?

• A) the beam is coherent
• B) one or more dimensions of the rectangular opening is near the wavelength of the source
• C) both dimensions of the rectangular opening are larger than the wavelength of the source
• D) only if the opening is circular

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