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# The physical structure of the human eye enables it to sense

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The physical structure of the human eye enables it to sense [#permalink]

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The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.

(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye

(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible

(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it

(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible

(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

I am looking for a good explanation for answer pick.
[Reveal] Spoiler: OA

Last edited by broall on 24 Jun 2017, 05:24, edited 2 times in total.
Reformatted question

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Re: The physical structure of the human eye enables it to sense [#permalink]

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02 May 2010, 05:05
beckee529 wrote:
The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.
(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

I am looking for a good explanation for answer pick.

C, D and E: it's not clear what the "it" is referring to.
B: "making it invisible" is misplaced and modifies "eye" changing the meaning.
A: is clear and grammatically correct.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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12 May 2010, 03:19
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cano wrote:
beckee529 wrote:
The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.
(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

I am looking for a good explanation for answer pick.

C, D and E: it's not clear what the "it" is referring to.
B: "making it invisible" is misplaced and modifies "eye" changing the meaning.
A: is clear and grammatically correct.

In C "it" is referring to infrared radiation, which is incorrect.
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Re: The physical structure of the human eye enables it to sense [#permalink]

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12 May 2010, 03:56
I chose A as well

(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye --> Correct
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible "it" does not refer to a clear antecedent
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it "it" does not refer to a clear antecedent
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible "because" is awkwardly placed with "however"
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible "it" does not refer to a clear antecedent

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The physical structure of the human eye enables it to sense [#permalink]

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03 Dec 2010, 09:53
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The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.

(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

Please can some explain why choice b is not correct ?
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Re: Need help with this SC ! [#permalink]

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03 Dec 2010, 12:11
ajit257 wrote:
The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.

(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

Please can some explain why choice b is not correct ?

Let me try

when -ing is used without comma , it is directly modifying the immediate previous noun, and comma + ing would modify the subject of the previous clause.

here the making it invisible doesnt modify eye... so B is wrong...

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Re: Need help with this SC ! [#permalink]

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03 Dec 2010, 12:30
I picked C, because of the usage "to be". Damn, should've stuck with my gut and picked A.

Wavelength shouldn't be the subject of the sentence, it should be infrared radiation since that is invisible to the eye.

Just wanted to add on to this: the word "Of" before infrared radiation turns the phrase "of infrared radiation" into a preposition. Aside from some idiomatic expressions, prepositions can't be subjects of the sentence. Therefore, given the context of the sentence, A would work best because it matches up subject and verb perfectly.

ajit257 wrote:
The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.

(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

Please can some explain why choice b is not correct ?

Last edited by USCTrojan2006 on 03 Dec 2010, 12:58, edited 1 time in total.

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Re: Need help with this SC ! [#permalink]

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03 Dec 2010, 14:38
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Didnt like "it" in any of the choices, therefore, picked A
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Re: Need help with this SC ! [#permalink]

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03 Dec 2010, 14:42
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ajit257 wrote:
The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.

(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye
(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible
(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it
(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible
(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

Please can some explain why choice b is not correct ?

Hi! This question is an excellent test of modification, which is heavily tested on the GMAT.

As always, when first evaluating a sentence it's best to ignore the "extra bits" - focus on the subject and verb.

First, we recognize that the semicolon divides two equal sentences; in effect, we can ignore everything that comes before it. So, let's only focus on the underlined portion.

In the original (and, of course, choice (A)), we have:

Quote:
infrared radiation is invisible because its wavelength is too long to be registered by the eye.

Seems like a perfectly sound sentence - it's clear what's invisible (IR), "its" has a single clear antecedent (IR) and no style issues. Lookin' good!

Next up is (B):
Quote:
however, the wavelength ... is too long to be registered by the eye making it invisible.

This one isn't as clear: "it" is supposed to refer to IR, but actually modifies the subject of the sentence, "the wavelength". As noted by our Trojan-loving poster, a prepositional phrase can't be the subject, so even though (B) contains "of infrared radiation" that's not a legal parent noun for "it".

Here's another very useful general rule for the GMAT: ignore prepositional phrases. Such phrases appear all the time and are pretty much always just in there to distract you from the basic sentence structure.

Next we have (C):
Quote:
infrared radiation is invisible because its wavelength is too long for the eye to register it.

More pronoun problems (pronouns are another very commonly tested grammar concept)! "it" at the end of the sentence could refer to either IR or wavelength. When you see an ambiguous pronoun, move on!

(Technically pronouns refer to the closest "legal" preceding parent noun - in this sentence that would be "wavelength" - but for the most part the GMAT abhors pronoun ambiguity.)

Quote:
however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible.

Same issue as (B) - "of infrared radiation" can't be the antecedent for "it".

Finally (E):
Quote:
however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible.

"that" renders this sentence awkward; also, "it" at the end could refer to IR, wavelength or the eye.

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Re: Need help with this SC ! [#permalink]

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03 Dec 2010, 17:26
I got it wrong by choosing 'C' rather than 'A'.
Thanks for the explanation.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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15 Jan 2011, 11:50
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The physical structure of human eye enables it to sense light of wavelenghs up to 0.0005 millimeters;infrared radiation,however, is invisble because its wavelength-0.1millimeters-is too long to be registered by the eye.

a)infrared radiation,however, is invisble because its wavelength-0.1millimeters-is too long to be registered by the eye.
b)however,the wavelength of infra red radiation is-0.1 millimeters-is too long to be registered by the eye making it invisible.
c)infrared radiation,however,is invisible because its wavelength-0.1 millimeters-is too long for the eye to register it.
d)however, because the wavelength of infrared radiation is 0.1 millimeters,it is too long for the eye to register and thus invisible.
e)however,infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register,thus making it invisible.

Last edited by broall on 24 Jun 2017, 05:21, edited 1 time in total.
Merged topic. Please search before posting question.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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16 Jan 2011, 02:20
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The physical structure of human eye enables it to sense light of wavelenghs up to 0.0005 millimeters;infrared radiation,however, is invisble because its wavelength-0.1millimeters-is too long to be registered by the eye.

a)infrared radiation,however, is invisble because its wavelength-0.1millimeters-is too long to be registered by the eye.
b)however,the wavelength of infra red radiation is-0.1 millimeters-is too long to be registered by the eye making it invisible.
c)infrared radiation,however,is invisible because its wavelength-0.1 millimeters-is too long for the eye to register it.
d)however, because the wavelength of infrared radiation is 0.1 millimeters,it is too long for the eye to register and thus invisible.
e)however,infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register,thus making
it invisible.

Hi,
We can straight forward eliminate B,C and E for Ambiguous pronoun reference 'it'. D has got a wrong sentence construction. A is the answer.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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03 Feb 2011, 17:21
straight A...agree with the explanation given by - sashikanth.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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03 Feb 2011, 23:46
Its a fight between A and C. But i feel A is more clear while C is a bit awkward.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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04 Feb 2011, 03:28
The physical structure of human eye enables it to sense light of wavelenghs up to 0.0005 millimeters;infrared radiation,however, is invisble because its wavelength-0.1millimeters-is too long to be registered by the eye.

a)infrared radiation,however, is invisble because its wavelength-0.1millimeters-is too long to be registered by the eye.
b)however,the wavelength of infra red radiation is-0.1 millimeters-is too long to be registered by the eye making it invisible.
c)infrared radiation,however,is invisible because its wavelength-0.1 millimeters-is too long for the eye to register it.
d)however, because the wavelength of infrared radiation is 0.1 millimeters,it is too long for the eye to register and thus invisible.
e)however,infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register,thus making it invisible.

Besides the IT problem, "for - to" is unidiomatic
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Re: The physical structure of the human eye enables it to sense [#permalink]

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05 Mar 2011, 05:29
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Want to know if there is any rule which establishes that "it" in C/D/E is referring to "wavelength"?
In D, I can though say it upto some extent, but not in C/E . It has shaken some of my basics. Can some1 explain this?

beckee529 wrote:
The physical structure of the human eye enables it to sense light of wavelengths up to 0.0005 millimeters; infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye.
(A) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long to be registered by the eye

RIGHT

(B) however, the wavelength of infrared radiation—0.1 millimeters—is too long to be registered by the eye making it invisible

Seems to suggest wavelength is too long and makes the eye invisible.

(C) infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it

the eye does not register wavelength

(D) however, because the wavelength of infrared radiation is 0.1 millimeters, it is too long for the eye to register and thus invisible

WORDY. Again wavelength is too long for the eye to register and thus invisible suggests the wavelength is invisble

(E) however, infrared radiation has a wavelength of 0.1 millimeters that is too long for the eye to register, thus making it invisible

Wordy again. Also infrared radiation cannot make ITSELF invisible as the sentence seems to suggest.
I am looking for a good explanation for answer pick.

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Re: The physical structure of the human eye enables it to sense [#permalink]

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01 Aug 2013, 19:25

I don't agree with the notion that "it do not refer to a clear antecedent" or "it refers to wavelength"

Reason:In choice C, we already got a "its", so "it" and "its" must refer to the same subject---infrared radiation.

So, what is wrong with choice C?

IMO, "it" is redundant here.
the sentence"because its wavelength···is too long for the eye to register" is complete, and we do not need a "it" after register!

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Re: The physical structure of the human eye enables it to sense [#permalink]

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02 Aug 2013, 00:12
nson wrote:

I don't agree with the notion that "it do not refer to a clear antecedent" or "it refers to wavelength"

Reason:In choice C, we already got a "its", so "it" and "its" must refer to the same subject---infrared radiation.

So, what is wrong with choice C?

IMO, "it" is redundant here.
the sentence"because its wavelength···is too long for the eye to register" is complete, and we do not need a "it" after register!

Hi nson.

You're correct. "it" is redundant in C.
For example:
WRONG: The test took me 1 hour to complete it <== "it" is redundant.
CORRECT: The test took me 1 hour to complete

Same question:
rivaling-the-pyramids-of-egypt-or-even-the-ancient-cities-of-30856.html?fl=similar

Hope it helps.
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Re: The physical structure of the human eye enables it to sense [#permalink]

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02 Aug 2013, 12:42
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nson wrote:
I don't agree with the notion that "it do not refer to a clear antecedent" or "it refers to wavelength"
Reason:In choice C, we already got a "its", so "it" and "its" must refer to the same subject---infrared radiation.
So, what is wrong with choice C?

In option C, “it” actually does not have a clear antecedent and therefore, option C has a pronoun ambiguity error.
Let’s look at option C:

Infrared radiation, however, is invisible because its wavelength—0.1 millimeters—is too long for the eye to register it.

Here is the sentence structure of Option C:
1. Infrared radiation, however, is invisible
2. because its wavelength—0.1 millimeters—is too long for the eye to register it

A: Now, if we look at it, the beginning of the second clause has possessive pronoun “its” – this pronoun clearly refers to Infrared radiation since there is no other noun before this pronoun.

B: However, when we reach the end of the second clause and encounter “it”, we have two nouns to which “it” could refer to – “Infrared radiation” or the subject of the “because clause” i.e. wavelength. Now, both the nouns are valid contenders for the antecedent of “it”. Therefore, there is a pronoun ambiguity in the clause.

For this reason, option C is incorrect.

Does this help!

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Re: The physical structure of the human eye enables it to sense [#permalink]

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25 Aug 2013, 05:32
Please explain how reference to it in choice D and E is wrong. IN D,E og says reference to it is not clear. can you highlight this.. is it in these sentences pointing wavelength or infrared (both) ?? how it in B is clear? Is the same error not in B ?

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Re: The physical structure of the human eye enables it to sense   [#permalink] 25 Aug 2013, 05:32

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