Chapter 18 of 18
Syllabus
Observing Space : Telescopes — Syllabus
Maharashtra Board · Class 9 · Science
What Observing Space : Telescopes covers in Maharashtra Board Class 9 Science: 4 topics, for the 2026-27 session.
44 questions20 flashcards5 concepts
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4 Topics · Maharashtra Board Class 9 Science · 2026-27
Topics in Observing Space : Telescopes
1
Forms of Light and Electromagnetic Radiation
- Light is an electromagnetic wave with characteristic wavelengths
- Human eyes can only see visible radiation (400-800 nm wavelength)
- Electromagnetic spectrum includes: Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays
2
Optical Telescopes
- Made with lenses or mirrors to observe visible light from space
- Refracting telescopes use lenses and work on principle of refraction
- Reflecting telescopes use mirrors and work on principle of reflection
3
Radio Telescopes
- Detect radio waves from heavenly objects (wavelengths longer than 20 cm)
- Made of parabolic dishes that reflect radio waves to a focal point
- Radio receiver at focus converts signals to data for computer analysis
4
Space-Based Telescopes
- Placed in space to avoid Earth's atmospheric problems
- No atmospheric absorption, turbulence, or weather interference
- Can observe 24/7 without daylight or city light problems
Key Concepts
Light is an electromagnetic waveThese telescopes use lenses or mirrorsThese telescopes use large parabolic dishesTelescopes placed in space (like HubbleEstablished in 1969
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What are the important topics in Observing Space : Telescopes for Maharashtra Board Class 9 Science?
Key topics in Observing Space : Telescopes include Forms of Light and Electromagnetic Radiation, Optical Telescopes, Radio Telescopes, Space-Based Telescopes. Study these first, then practise questions on each for Class 9 exams.
How should I revise Observing Space : Telescopes for Class 9 exams?
Learn the core ideas first, then work through the 44 practice questions on Observing Space : Telescopes. Revise definitions regularly and use flashcards for quick recall before the exam.
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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