Question

Which of these statements best explains why the size of the refracting telescope lens is kept small at the cost of reducing its capacity to gather radiations from space?

•Big telescopes are more portable.
•Big lenses gather harmful radiations from space.
•Big lenses do not focus light properly to produce clear images.
•Big telescopes are not reliable enough to be used for research.

Answer 1

Large lenses cannot be constructed in such a way that light passes through them uniformly. Just as a prism disperses white light into its component colors, the lens in a refracting telescope focuses red and blue light differently. This deficiency is known as chromatic aberration.Careful design and choice of materials can largely correct chromatic aberration, but it is very difficult to eliminate entirely. And as the lens diameter increases, so do the aberration and the number of problems that need to be solved to correct it

Answer 2

So, it's the third one?

Answer 3

yes you can say