* Radio waves have longer wavelengths than visible light: This means they spread out more and don't easily focus with lenses like we use for visible light.
* Curved surfaces reflect waves: A curved dish acts like a giant mirror for radio waves. It reflects the incoming waves, concentrating them towards a central point called the focal point.
* Focus for amplification: At the focal point, a receiver antenna is placed. This antenna picks up the concentrated radio waves, amplifying the signal for analysis.
Think of it like a satellite dish. It's a big, curved surface that reflects the satellite signals to a small receiver, making the signal much stronger.
