Observing Space : Telescopes
Maharashtra Board · Class 9 · Science
Quick revision notes for Observing Space : Telescopes — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
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
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
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
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
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