Which part collects the light in a reflecting telescope?

1. A reflecting telescope was first built by Isaac Newton in the 1680s. 2. It uses a curved primary mirror instead of a large lens. 3. The mirror gathers the light and reflects it to a focus. 4. Because the light never passes through the glass, there is no colour blurring. _Source: Siyavula Natural Sciences Grade 8 (CC BY 4.0), 2. Reflecting telescopes_