URGENT SCIENCE HELP!!! Q- What is a major disadvantage of using a lens to gather light in a telescope?

Question

What is a major disadvantage of using a lens to gather light in a telescope?

Answer 1

Here are some disadvantages:

1. Typically cannot be collimated except at factory.

2. Can have chromatic abberation.

3. Cost of producing a large achromatic or apochromatic lens is significantly more expensive then producing the same size high-quality mirror.

Think the 2nd or 3rd ones are probably the main disadvantages.

Answer 2

less resolution in the image?