Concave and convex lenses can focus and magnify images that are small and far away {telescope}|. Light amount increases with larger opening. Refracting telescopes have a large lens that collects light to a focal point, and a second small high-curvature lens that focuses image for viewing. Reflecting telescopes have a large lens that collects light to a mirror, which focuses light on a second small high-curvature lens that focuses image for viewing.
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Date Modified: 2022.0224