Multiple choice

The dish of a radio telescope is

  1. concave

  2. convex

  3. plane

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dish (parabolic reflector) of a radio telescope is concave - it curves inward like a bowl. This concave shape focuses incoming parallel radio waves to a single point (the focus), where a receiver collects the signals. This design allows radio telescopes to detect extremely weak radio signals from space.

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