For a Coherent Plane Wave Approaching an Obstacle with a Rectangular

question 19

Multiple Choice

For a coherent plane wave approaching an obstacle with a rectangular opening, diffraction becomes significant under which of the following circumstances?

• A) both dimensions of the rectangular opening are comparable to the wavelength
• B) one or more dimensions of the rectangular opening are comparable to the wavelength
• C) both dimensions of the rectangular opening are larger than the wavelength
• D) only if the opening is circular

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