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Images from ground-based telescopes are invariably distorted by the

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Re: Images from ground-based telescopes are invariably distorted by the [#permalink]

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New post 24 Aug 2017, 15:21
shrewd1 wrote:
GMATNinja my issue with OA is that even though option E suggests that space telescopes have a drawback and cannot do a certain thing, it does not cast doubt on the argument that ground telescopes might become obsolete. maybe there would be a new kind of telescope/maybe even ground telescopes suck at that thing. We dont know!
is this not a very good quality QG question?

You are right that ground telescopes might still become obsolete, even if (E) is true. However, we do not need an answer that PROVES that ground telescopes will not become obsolete. Rather, we need an answer choice that casts the most doubt on the author's conclusion. Choice (E) directly weakens the author's argument and conclusion, so it is the best answer.
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Re: Images from ground-based telescopes are invariably distorted by the [#permalink]

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New post 10 Sep 2017, 01:52
sayantanc2k wrote:
smartguy595 wrote:
Really not able to convince how option E is the correct answer.

we need to assume more to chose this.

Experts please help, why 'B' is wrong


The conclusion is about a causal relation:

Space telescopes are better in one feature, and HENCE they will make earth telescopes obsolete.

Stating a negative feature of the space telescopes attacks this causal relation (though it may not directly attack the possibility that earth telescope will be obsoleted). Because space telescopes has a negative feature they will NOT be able to make the earth satellites obsolete.

If one considers "ground-based telescopes will soon become obsolete" the conclusion then your point is definitely valid. But if one considers "Superior feature of space telescope will cause ground-based telescopes to be obsolete", then option E is correct. In GMAT this causal relation as a conclusion is often tested.

For the same reason stated above option B is wrong. It does not attack the causal relation, but only supports why earth based telescopes may not be obsoleted. (Moreover, the condition that was used to prove that Space telescopes will replace earth telescopes, still holds good - even after mounting the telescopes on higher grounds, the distortion will not be eliminated, and hence the space telescopes still remain better of the two - nonetheless, this does not play any role in attacking the causal relation.)



Hi,
Plz explain how can we assume that light gathering capacity is better on ground based telescopes. The passage mentions 2 telescopes but we cant rule out that another kind of telescope may exist which contains better light gathering capacity and so, ground based telescope does not have such a feature. Also, why is option D wrong?

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Re: Images from ground-based telescopes are invariably distorted by the [#permalink]

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New post 10 Sep 2017, 01:55
GMATNinja wrote:
shrewd1 wrote:
GMATNinja my issue with OA is that even though option E suggests that space telescopes have a drawback and cannot do a certain thing, it does not cast doubt on the argument that ground telescopes might become obsolete. maybe there would be a new kind of telescope/maybe even ground telescopes suck at that thing. We dont know!
is this not a very good quality QG question?

You are right that ground telescopes might still become obsolete, even if (E) is true. However, we do not need an answer that PROVES that ground telescopes will not become obsolete. Rather, we need an answer choice that casts the most doubt on the author's conclusion. Choice (E) directly weakens the author's argument and conclusion, so it is the best answer.



I had the same doubt and so I eliminated option E, but I fail to understand why i8s option D incorrect? In d, we are providing an advantage feature of ground based telescope.

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Re: Images from ground-based telescopes are invariably distorted by the   [#permalink] 10 Sep 2017, 01:55

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