Question

which are the difficulties of refracting telescope useful for space observation​

Answer 1

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Because of flaws in its design, such as the shape of the lens and the narrow field of view, the images were blurry and distorted. Despite these flaws, the telescope was still good enough for Galileo to explore the sky. He used it to view craters on the Moon, the four largest moons of Jupiter, and the phases of Venus.

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Answer 2

Answer:

Problems with Refracting Telescopes:

• Chromatic abberation. The red and blue light focusses at different locations creating coloured halos. This occurs because the path taken by blue light through glass bends more than red light.
• Chromatic abberation. The red and blue light focusses at different locations creating coloured halos. This occurs because the path taken by blue light through glass bends more than red light. Lens distortion. A very large glass lens will tend to become distorted due to its own weight.The largest refracting telescope (built in the late 1800's) has a diameter of only 40 inches because of this problem.

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