Telescopes and observation methods – basic principles
How it works
Optical telescopes collect and concentrate visible light so that distant celestial objects appear brighter and more detailed. There are lens telescopes (refractors) and mirror telescopes or reflectors. In astronomy, other telescopes are also used, for example radio telescopes that receive radio waves from space. Important observation methods are visual observation, photography, photometry for measuring brightness, and spectroscopy for analyzing light. The Sun may only be observed with suitable protective filters or with safe methods such as projection. Which method and which instrument are appropriate depends on the observation target, such as the Moon, planets, stars, nebulae, or galaxies.
Telescopes collect radiation from space; optical telescopes collect visible light with lenses or mirrors. Depending on the observation target, different instruments and methods are used, for example direct observation, photography, photometry, spectroscopy, or radio observation.
An example
What is the main difference between a lens telescope (refractor) and a mirror telescope or reflector telescope?
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50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Astronomy. The topic assignment may vary by federal state.