Question

what are the 3 difficulties in using refracting telescope
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Answer 1

$\huge\mathcal\red{Answer}$

• 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.

Answer 2

Explanation:

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. ...

Lens distortion. A very large glass lens will tend to become distorted due to its own weight