Existing optical lenses are not thin or flat enough to : GMAT Critical Reasoning (CR)
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# Existing optical lenses are not thin or flat enough to

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Existing optical lenses are not thin or flat enough to [#permalink]

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19 Mar 2013, 14:20
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Question Stats:

91% (02:20) correct 9% (01:42) wrong based on 116 sessions

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Existing optical lenses are not thin or flat enough to remove distortions, such as spherical aberration and astigmatism, which prevent the creation of a sharp image. Correction of those distortions requires complex solutions, such as multiple lenses that increase weight and take up space. To overcome these challenges, scientists have developed a new superthin, flat lens. The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre, causing the beam to sharply focus without distorting the images.

In the argument given, the two portions in boldface play which of the following roles?

(A) The first states a problem with existing optical lenses and the second states the solution for this problem that has been developed by scientists

(B) The first is the main conclusion of the argument and the second provides support for this main conclusion

(C) The first is evidence the accuracy of which is questioned later in the argument; the second is a conclusion that the argument supports

(D) The first mentions a problem with existing optical lenses and the second describes the structure of a new type of lens that can solve that problem

(E) The first is a problem associated with one type of optical lens; the second advocates the use of an alternative lens

Explanation
The argument basically states that there is a problem associated with currently available optical
lenses and that scientists have developed a new type of lens that can resolve this problem. The
first bold part describes the problem and the second bold part describes the structure of the new
optical lens and how it works.
A. While this option looks good, notice that the second bold part does not actually state the
solution to this problem; it just provides a description of the new optical lens.
B. The first and second bold part are in fact stating opposite things so one cannot be providing
support for the other
C. The accuracy of the first bold part is never at question in the argument. The second is not
really a conclusion
E. The first bold part is correct but the second bold part incorrectly uses the term ‘advocate’. The
[Reveal] Spoiler: OA

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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 15:02
I'm stuck between A and D.

(A) The first states a problem with existing optical lenses and the second states the solution for this problem that has been developed by scientists
(D) The first mentions a problem with existing optical lenses and the second describes the structure of a new type of lens that can solve that problem

In D : " the second describes the structure of a new type of lens that can solve that problem"
In the passage : "scientists have developed a new superthin"

So the new lens are already finished, and they solve the problem. IMO A but NOT sure
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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 15:26
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Yesss this is it the BF +1

B and E are out because the first BF is neither the main conclusion nor a problem associated with one type of lens
C is out because the second BF is not the conclusion of any argument

Well , this is between A or D

First BF: Existing optical lenses are not thin or flat enough to remove distortions

second BF: To overcome these challenges, scientists have developed a new superthin, flat lens. The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre,

(A) The first states a problem with existing optical lenses and the second states the solution for this problem that has been developed by scientists

(D) The first mentions a problem with existing optical lenses and the second describes the structure of a new type of lens that can solve that problem

the argument stated only that the purpose of scientists is to overcome the challenges by creating a new type that can solve the problem and not that they find the utlimate solution hence A is out

We are left with D, which is the correct answer in my opinion
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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 15:42
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Zarrolou wrote:
In D : " the second describes the structure of a new type of lens that can solve that problem"
In the passage : "scientists have developed a new superthin"

So the new lens are already finished, and they solve the problem. IMO A but NOT sure

the new lens are already finished that what you said .. but none has tried them yet , hence we can't assume that they find the SOLUTION ; they just develop a solution that can solve the problem according to the explanation given by the second BF ( the surface of this lens is patterned ..... ) [ it's just the theoretical aspect of the thing, can't conclude that will work for sure ..]
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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 17:21
my take is D
A is wrong coz Correction of those distortions requires complex solutions, such as multiple lenses that increase weight and take up space. To overcome these challenges, scientists have developed a new superthin, flat lens.then somes the second bold face
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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 17:52
I picked D over A.

The bolded portion talked more about the structure. If the bolded portion included the rest of the sentence, I would have chose A.
The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre, causing the beam to sharply focus without distorting the images.
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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 18:35
I would like to go with D.
The first is a problem, and the second describes, what is so good about the other lens that is not present in the first lens.
B and C can be elimintaed at first glimpse.

A,d and E remains
E can be eliminated because what follows, the description of the new lens.
I feel that word advocates means the statement needs to provide a reason ...why the statement should be true.
A cannot be true because the soln for the problem is the new lens and not the description of the new lens.

Hi Carcass, it will be gr8 if we provide the source of the questions that you are posting...I m looking fro a book that provides me with practice prob.......

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Re: Existing optical lenses are not thin or flat enough to remov [#permalink]

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19 Mar 2013, 20:31
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Expert's post
DoItRight wrote:
I picked D over A.

The bolded portion talked more about the structure. If the bolded portion included the rest of the sentence, I would have chose A.
The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre, causing the beam to sharply focus without distorting the images.

Good Call.
Let me explain why (A) is not correct (I have given the explanation elsewhere too)

A is a sneaky little option which could make you fall for it, especially if you do not read the other option choices. Beware of easy A answers! Ensure that you read all the options properly.

First bold part - Existing optical lenses are not thin or flat enough to remove distortions - a problem with current optical lenses
Second bold part - The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre - description of a new type of optical lens

(A) The first states a problem with existing optical lenses and the second states the solution for this problem that has been developed by scientists.

The first does state a problem with existing lenses - they are not thin and flat enough to remove distortion.
The solution developed is 'a lens that is super thin and flat'
The second bold statement doesn't 'state' the solution. It tells you 'how' the new lens has solved the problem.

The question is not difficult. But people would fall for the tricky option A especially under pressure on the test and if the argument is made a little more convoluted by adding more junk sentences in the middle.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Moderator Joined: 01 Sep 2010 Posts: 3091 Followers: 785 Kudos [?]: 6540 [0], given: 1012 Re: Existing optical lenses are not thin or flat enough to remov [#permalink] ### Show Tags 20 Mar 2013, 02:55 VeritasPrepKarishma wrote: DoItRight wrote: I picked D over A. The bolded portion talked more about the structure. If the bolded portion included the rest of the sentence, I would have chose A. The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre, causing the beam to sharply focus without distorting the images. Good Call. Let me explain why (A) is not correct (I have given the explanation elsewhere too) A is a sneaky little option which could make you fall for it, especially if you do not read the other option choices. Beware of easy A answers! Ensure that you read all the options properly. First bold part - Existing optical lenses are not thin or flat enough to remove distortions - a problem with current optical lenses Second bold part - The surface of this lens is patterned with tiny metallic stripes which bend light differently as one moves away from the centre - description of a new type of optical lens (A) The first states a problem with existing optical lenses and the second states the solution for this problem that has been developed by scientists. The first does state a problem with existing lenses - they are not thin and flat enough to remove distortion. The solution developed is 'a lens that is super thin and flat' The second bold statement doesn't 'state' the solution. It tells you 'how' the new lens has solved the problem. The question is not difficult. But people would fall for the tricky option A especially under pressure on the test and if the argument is made a little more convoluted by adding more junk sentences in the middle. Well..........under pressure and fatigue this question becomes tricky for sure _________________ Manager Joined: 19 Aug 2012 Posts: 58 Followers: 1 Kudos [?]: 65 [0], given: 9 Re: Existing optical lenses are not thin or flat enough to remov [#permalink] ### Show Tags 20 Mar 2013, 03:42 my take D. last two options are A and D but D is more appropriate as it is describing the bold face only and not includes the passage info like Scientist have developed. _________________ giving kudos is the best thing you can do for me.. Moderator Joined: 01 Sep 2010 Posts: 3091 Followers: 785 Kudos [?]: 6540 [0], given: 1012 Re: Existing optical lenses are not thin or flat enough to remov [#permalink] ### Show Tags 20 Mar 2013, 13:51 OA and OE added :9 thanks for discussion. _________________ Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7125 Location: Pune, India Followers: 2138 Kudos [?]: 13691 [0], given: 222 Re: Existing optical lenses are not thin or flat enough to remov [#permalink] ### Show Tags 20 Mar 2013, 19:08 carcass wrote: Well..........under pressure and fatigue this question becomes tricky for sure Yes, so make a promise to yourself - Irrespective of how fatigued you are on exam day during the Verbal section, you will still read all the options and not move on after selecting the first passable option you get. _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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11 Apr 2016, 13:10
problem arises when choosing between option A and D
Second part of both options are almost same
differences are in first part of both of them
in option A,use of "The first states a problem with existing optical lenses" makes it a genralised statement applicable to all types of lenses which is not the actual case
Re: Existing optical lenses are not thin or flat enough to   [#permalink] 11 Apr 2016, 13:10
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