JMSS Science Practice Test

A parabolic mirror is defined by its reflecting surface being shaped like a parabola, and the key idea is how that shape handles incoming light. A parabola has the property that light rays coming in parallel to its axis reflect and converge at a single point, the focus. That means distant light is concentrated to one spot, which is why parabolic mirrors are ideal for gathering and focusing light in systems like telescopes, satellite dishes, and solar concentrators. Other shapes don’t produce this same single focus: a spherical mirror can focus parallel rays poorly due to spherical aberration; a flat mirror simply reflects without changing the convergence or divergence of the beam; a convex mirror makes parallel rays diverge, creating a smaller, virtual image instead of a real focus.