PrepTest 140, Section 4, Question 20
Physicists are often asked why the image of(441 more words not shown)
The main point of the(9 more words not shown)
- Amust include two(2 more words not shown)
- Bhas yet to(2 more words not shown)
- Cmust be determined(2 more words not shown)
- Dis still subject(2 more words not shown)
- Eis extremely(1 more words not shown)
Reading the passage
We've already predicted the author's conclusion: explaining an image requires both the mirror and the observer. The front-to-back account falls short because it treats the apparent chair as a real object and tries to explain the mirror's work without the viewer's role.
What we’re looking for
The answer can express that positive requirement instead of merely repeating that the front-to-back explanation fails. We are looking for the two parts of a complete account.
Working the answers
- ACorrect
The two elements are stated in the final paragraph: “what mirrors do” and the observer's experience of looking at a reflection (paragraph 4). The author explains why both matter: an image involves an observer and a point of view. A captures the requirement that emerges from the criticism.
- B
The author does not end by saying the explanation remains unknown. The conclusion specifies what an adequate explanation must include, and the opening provides an account that includes the observer.
- C
Physicists supply the explanations discussed, but the author never requires that an adequate account be determined by physicists. This substitutes a claim about who should explain for a claim about what an explanation must contain.
- D
The existence of competing accounts is background. The main point is the author's reason for rejecting an observer-free account, not simply that people debate the issue.
- E
The author does not conclude that explanation is extremely complicated. The argument identifies a missing element and explains its importance.
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