3. Why do you think the primary or objective lens of a refracting telescope should have a longer focal length?​

Because the longer the focal length, the smaller the patch of sky you're observing. But a longer focal length also gives a higher possible magnification.

the sentence that contains a restrictive clause is a.they decided to meet where the band was performing

explanation:

a restrictive clause is also known as an essential clause

the narrator is saying that the old lady made her feel uncomfortable. you know this because they say "i found that rather irksome", "perhaps it was her being so upright and trim", and "i don't think it was that, because i thought that quaintly pleasant." hope this !