Discussion
Match the phase difference between two perpendicular equal components with the polarisation it gives.
1. Zero 2. Ninety degrees 3. Forty-five degrees
P. Elliptical Q. Linear R. Circular
Answer: B
The three are points on one continuum: as the phase difference grows from zero to ninety degrees the line opens into an ellipse and then closes into a circle. Unequal amplitudes give an ellipse at every phase difference except zero.
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