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# Every photograph, because it involves the light rays that

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Senior CR Moderator
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Every photograph, because it involves the light rays that  [#permalink]

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23 Sep 2017, 03:06
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Difficulty:

55% (hard)

Question Stats:

58% (01:49) correct 42% (01:31) wrong based on 297 sessions

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Every photograph, because it involves the light rays that something emits hitting film, must in some obvious sense be true. But because it could always have been made to show things differently than it does, it cannot express the whole truth and, in that sense, is false. Therefore, nothing can ever be definitively proved with a photograph.

Which one of the following is an assumption that would permit the conclusion above to be properly drawn?

(A) Whatever is false in the sense that it cannot express the whole truth cannot furnish definitive proof.
(B) The whole truth cannot be known.
(C) It is not possible to determine the truthfulness of a photograph in any sense.
(D) It is possible to use a photograph as corroborative evidence if there is additional evidence establishing the truth about the scene photographed.
(E) If something is being photographed, then it is possible to prove definitively the truth about it.

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Re: Every photograph, because it involves the light rays that  [#permalink]

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10 Oct 2017, 18:16
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Every photograph, because it involves the light rays that something emits hitting film, must in some obvious sense be true. But because it could always have been made to show things differently than it does, it cannot express the whole truth and, in that sense, is false. Therefore, nothing can ever be definitively proved with a photograph.

Which one of the following is an assumption that would permit the conclusion above to be properly drawn?

(A) Whatever is false in the sense that it cannot express the whole truth cannot furnish definitive proof. -Correct. The argument states that since the photograph can't express the complete truth, thus, it is false. Since it is false, we can't definitely prove anything. Similarly this option states that whatever is false cannot be used to prove anything. This matches the argument word by word
(B) The whole truth cannot be known. -Irrelevant. We are worried about whether the photograph can explain the complete truth
(C) It is not possible to determine the truthfulness of a photograph in any sense. -In the argument we are talking about the truthfulness of an object and NOT the photograph. Thus this option reverses the causality
(D) It is possible to use a photograph as corroborative evidence if there is additional evidence establishing the truth about the scene photographed. -Okay. This is a mere fact which is irrelevant with respect to the argument at hand
(E) If something is being photographed, then it is possible to prove definitively the truth about it. -Irrelevant
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##### General Discussion
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Re: Every photograph, because it involves the light rays that  [#permalink]

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28 Sep 2017, 03:01
I selected the answer as C which appears to be wrong. Can someone tell how?

Applying negation on option C: It is possible to determine the truthfulness of a photograph in any sense. which breaks the conclusion. Hence shouldnt C be right?
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Re: Every photograph, because it involves the light rays that  [#permalink]

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10 Oct 2017, 05:17
Sanjeetgujrall wrote:
I selected the answer as C which appears to be wrong. Can someone tell how?

Applying negation on option C: It is possible to determine the truthfulness of a photograph in any sense. which breaks the conclusion. Hence shouldnt C be right?

Hi Sanjeetgujrall,

Let's analyze the question:

Every photograph, because it involves the light rays that something emits hitting film, must in some obvious sense be true. But because it could always have been made to show things differently than it does, it cannot express the whole truth and, in that sense, is false. Therefore, nothing can ever be definitively proved with a photograph.

Our conclusion is in dark blue, while our premise is in light blue. I think this is where you became confused. (C) talks about the premise, its truthfulness, but doesn't talk about how we can use the photo as proof. Does truthfulness = definitive proof? No. (A) does this. This is an assumption question, and you are correct to negate.
Here is a link to some more detailed explanations if this isn't clear: https://www.manhattanprep.com/lsat/foru ... t1310.html

Which one of the following is an assumption that would permit the conclusion above to be properly drawn?

(A) Whatever is false in the sense that it cannot express the whole truth cannot furnish definitive proof.
(C) It is not possible to determine the truthfulness of a photograph in any sense.

Does this help?
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Re: Every photograph, because it involves the light rays that &nbs [#permalink] 10 Oct 2017, 05:17
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