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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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26 Jan 2013, 10:22
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Difficulty:

15% (low)

Question Stats:

81% (02:27) correct 19% (01:15) wrong based on 121 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
[Reveal] Spoiler: OA

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

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26 Jan 2013, 10:39
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Is it 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
"Existing optical lenses are not thin or flat enough" - yes that is the problem
From " To overcome these challenges... " talks about the dvelopement of solution to the above problem. But unfortunately this part of the sentence is not made bold.
The bold part just describes the structure

(B) The first is the main conclusion of the argument and the second provides support for this
main conclusion
Our conclusion is not about existing optical lenses, but about the developed alternative lenses.
(C) The first is evidence the accuracy of which is questioned later in the argument; the second is
a conclusion that the argument supports
No where the argument is questioned. The statements are given as facts.
(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
"Existing optical lenses are not thin or flat enough" - yes that is the problem
And the second bold part describes the structure of the new lens that can solve the problem

(E) The first is a problem associated with one type of optical lens; the second advocates the use
of an alternative lens
The second one doesn't advocates. It just states a fact- i.e. structure of the alternative.
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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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26 Jan 2013, 19:44
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Expert's post
jgomey wrote:
A is tricky.

The second bold phrase describes the solution in the previous sentence. So the second sentence is not the actual solution.

Right?

D makes more sense.

BTW, even though this is a bolded phrase question, I don't think the it is 700 level. 600-650 IMO.

Yes, absolutely correct. 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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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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26 Jan 2013, 10:50
Choice(D) is correct. Choice(A) is a trap answer.
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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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26 Jan 2013, 12:40
Wow i did good by not falling for A in the first place..option A seems obvious and too simple for a question like that while option d has maintained the line of reasoning in the stimuli thus it is the scope for an answer
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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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26 Jan 2013, 19:02
A is tricky.

The second bold phrase describes the solution in the previous sentence. So the second sentence is not the actual solution.

Right?

D makes more sense.

BTW, even though this is a bolded phrase question, I don't think the it is 700 level. 600-650 IMO.
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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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19 Oct 2013, 05:19
Nothing beats the feeling of getting a BOLD FACE CR correct. :D
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Re: Existing optical lenses are not thin or flat enough to [#permalink]

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11 Apr 2016, 14:08
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
So correct answer option D
Re: Existing optical lenses are not thin or flat enough to   [#permalink] 11 Apr 2016, 14:08
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# Existing optical lenses are not thin or flat enough to

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