Correct option is B
Parabolic antennas use a parabolic reflector to focus electromagnetic waves into a highly directional beam.
This focusing action results in very high gain and a narrow beamwidth, which are essential for:
- Satellite communications
- Radar systems
- Long-distance point-to-point links
The feed antenna placed at the focus illuminates the reflector, and the reflected waves travel parallel to the axis, concentrating energy in one direction.
