PrepTest 140, Section 4, Question 21
Physicists are often asked why the image of(441 more words not shown)
According to the passage, the(8 more words not shown)
- Aa result of(8 more words not shown)
- Ba result of(14 more words not shown)
- Cexplained by the(10 more words not shown)
- Dexplained by the(6 more words not shown)
- Eexplained by the(10 more words not shown)
Reading the passage
Return to the opening account. We ordinarily rotate our field of sight around a vertical axis when turning from the object to its reflection. That is why this account says the image usually appears reversed left-to-right. The orientation of the viewer is doing the explanatory work.
Working the answers
- A
The front-to-back account is the rival explanation the author criticizes. It is not presented as the mechanism that produces the left-to-right reversal described in the opening.
- BCorrect
This states the first paragraph's causal explanation: the usual rotation around a vertical axis makes the reversal appear left-to-right relative to the observer. It matches both the movement and the resulting appearance.
- C
The opening refers to the observer's position and orientation, not the reflected object's size and position. This changes which features explain the reversal.
- D
Two- and three-dimensional features matter to the criticism of treating an image as a real chair. Merely recognizing those dimensions does not explain why the apparent reversal is left-to-right rather than top-to-bottom.
- E
Mental constructs explain why the front-to-back account feels natural to us. That is a different question from what produces the directional reversal in the field-of-sight account.
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