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The beam gets deteriorated when it is moved along a line perpendicular to the main axis passing through focus?

The beam gets deteriorated when it is moved along a line perpendicular to the main axis passing through focus? Correct Answer True

Beam pattern is maximum only when the feed is placed at the focus of the parabola. When the feed is moved along the main axis, beam gets broadened. When it is moved along perpendicular line beam gets deteriorated.

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