https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:observing-space-telescopes/x345505a97fc4a662:space-telescope/e/optical-reflecting-telescopes 2025-12-18T18:40:53.641757593Z Optical telescopes This exercise introduces students to optical telescopes, their structure, working principles, and uses. It builds both factual recall and understanding through varied question types, based on the Class 9 subsection on optical telescopes. Yajurva Joshi exercise https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:observing-space-telescopes/x345505a97fc4a662:space-telescope/e/radio-telescope 2025-12-18T18:40:53.641757593Z Radio telescope This exercise explores radio telescopes, their structure, working principles, and advantages. It emphasizes information- and understanding-based questions to support deeper comprehension of radio astronomy. Yajurva Joshi exercise https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:observing-space-telescopes/x345505a97fc4a662:space-telescope/e/space-telescopes 2025-12-18T18:40:53.641757593Z Space telescopes This exercise explores space telescopes, including the Hubble and Chandra observatories, focusing on key facts, structure, and understanding-based applications of how they work outside Earth’s atmosphere. Yajurva Joshi exercise