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30 Mar 2020, 06:30
Kudos
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
71% (02:07) correct
29%
(02:12)
wrong
based on 835
sessions
History
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Not Attempted Yet
A number of seriously interested amateur astronomers have tested the new Exodus refractor telescope. With it, they were able to observe in crisp detail planetary features that were seen only as fuzzy images in their 8-inch (approximately 20-centimeter) Newtonian telescopes, even though the 8-inch telescopes, with their wider apertures, gather more light than the 4-inch (approximately 10-centimeter) Exodus. Given these amateur astronomers’ observational findings, any serious amateur astronomers ought to choose the Exodus if she or he is buying a telescope for planetary observation.
Which one of the following most seriously weakens the argument?
(A) Telescopes of certain types will not perform well unless they have been precisely collimated, a delicate adjustment requiring deftness.
(B) Image quality is only one of several different factors that, taken together, should determine the choice of a telescope for planetary observation.
(C) Many serious amateur astronomers have no intention of buying a telescope for planetary observation.
(D) The comparisons made by the amateur astronomers were based on observations made during several different observation sessions.
(E) The substance used to make the lenses of Exodus telescopes differs from that used in the lenses of other telescopes.
Which one of the following most seriously weakens the argument?
(A) Telescopes of certain types will not perform well unless they have been precisely collimated, a delicate adjustment requiring deftness.
(B) Image quality is only one of several different factors that, taken together, should determine the choice of a telescope for planetary observation.
(C) Many serious amateur astronomers have no intention of buying a telescope for planetary observation.
(D) The comparisons made by the amateur astronomers were based on observations made during several different observation sessions.
(E) The substance used to make the lenses of Exodus telescopes differs from that used in the lenses of other telescopes.
12 Apr 2020, 10:57
Kudos
Bookmarks
Bunuel
So the passage says that the 4" Exodus telescope is better than the 8" Newtonian telescopes, because the 4" Exodus telescope gives crisp detail planetary features that were seen only as fuzzy images in 8" Newtonian telescopes. We have to weaken this argument. We have to show that 4" Exodus telescope is not necessarily better just because it gives a clearer picture.What if there are other Metrics/qualities that decide the quality of a picture. So based on just one quality we cannot convincingly conclude that Exodus is better than Newtonian.
(A) Telescopes of certain types will not perform well unless they have been precisely collimated, a delicate adjustment requiring deftness. : Irrelevant INCORRECT
(B)Image quality is only one of several different factors that, taken together, should determine the choice of a telescope for planetary observation : Correctly brings in doubt the conclusion, that 4" Exodus is better. CORRECT.
(C)Many serious amateur astronomers have no intention of buying a telescope for planetary observation : Irrelevant INCORRECT
(D)The comparisons made by the amateur astronomers were based on observations made during several different observation sessions. : Does not bring any doubt regarding the 4" Exodus telescope. INCORRECT
(E)The substance used to make the lenses of Exodus telescopes differs from that used in the lenses of other telescopes : So both the telescopes have different lenses , but does not tell us which is better. Hence Irrelevant , INCORRECT
Ans- B
Hope it's clear.
08 May 2023, 20:43
Kudos
Bookmarks
what about A
what if the serious amature astronomers donot have the deftness required to operate Exodus telescope. Then how would they watch it.
kindly explain
what if the serious amature astronomers donot have the deftness required to operate Exodus telescope. Then how would they watch it.
kindly explain
In my opinion, elimination of Option A was on a very weak ground. However, there is a long way to go before I start becoming more confident in my ability to eliminate the CR options. Thanks for sharing your thought process though. I'll try and replicate this perspective in other CR questions 
