Question
What are the difficulties in using ground-based optical telescopes? How are they overcome?
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Answer
Difficulties:
- The intensity of visible light coming from a heavenly body decreases due to absorption as it passes through the Earth’s atmosphere.
- Due to changes in atmospheric temperature and pressure light rays change their path.
- Because of sunlight, we cannot use optical telescopes during the day.
- During the night, city lights and cloudy weather cause difficulties.
Solution:
- To reduce these problems, optical telescopes are situated on top of mountains, in uninhabited places.
- To get rid of all the above problems completely, the telescope is placed above the earth’s atmosphere, in space.
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