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23 May 2026, 01:19
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
88% (01:05) correct
12%
(01:00)
wrong
based on 25
sessions
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Time
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Not Attempted Yet
Because metallic mirrors absorb some light, they waste energy. When light strikes a metallic mirror, electrons in the mirror move, using energy and dimming the reflected image. As a result, metallic mirrors cannot be used in applications in which minimizing energy loss is important, such as high-powered lasers.
Which one of the following most accurately expresses the argument's main conclusion?
(A) Metallic mirrors reduce the effectiveness of high-powered lasers.
(B) Part of the light falling on metallic mirrors tends to be absorbed by them.
(C) High-powered lasers require mirrors that conserve energy.
(D) A tendency to waste energy is the most significant disadvantage of metallic mirrors.
(E) Metallic mirrors are unsuitable for applications where it is crucial to minimize energy loss.
Which one of the following most accurately expresses the argument's main conclusion?
(A) Metallic mirrors reduce the effectiveness of high-powered lasers.
(B) Part of the light falling on metallic mirrors tends to be absorbed by them.
(C) High-powered lasers require mirrors that conserve energy.
(D) A tendency to waste energy is the most significant disadvantage of metallic mirrors.
(E) Metallic mirrors are unsuitable for applications where it is crucial to minimize energy loss.
23 May 2026, 06:39
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Because metallic mirrors absorb some light, they waste energy. When light strikes a metallic mirror, electrons in the mirror move, using energy and dimming the reflected image. As a result, metallic mirrors cannot be used in applications in which minimizing energy loss is important, such as high-powered lasers.
Which one of the following most accurately expresses the argument's main conclusion?
This question is a specific type of Conclusion question that asks us to find the argument's "main" conclusion. So, the correct answer will not just be a conclusion that follows from the passage. It will state the main point of the passage.
The main point is the final conclusion toward which everything else in the passage leads.
In answering such a question, it's good to be aware that the correct answer may either state an unstated conclusion that follows from everything the passage says or come close to simply repeating a statement in the passage.
(A) Metallic mirrors reduce the effectiveness of high-powered lasers.
This is supported by the statements in the passage.
However, it's not the main conclusion since the point of mentioning lasers is just to provide an example. The main conclusion is a broader point about metallic mirrors in general.
Eliminate.
(B) Part of the light falling on metallic mirrors tends to be absorbed by them.
The passage does say this, but it's not the main point of the passage toward which everything else in the passage leads. It's a supporting fact.
Eliminate.
(C) High-powered lasers require mirrors that conserve energy.
The last sentence of the passage does support this choice.
However, it's not the main conclusion since the point of mentioning lasers is just to provide an example. The main conclusion is a broader point about metallic mirrors in general.
Eliminate.
(D) A tendency to waste energy is the most significant disadvantage of metallic mirrors.
The information presented by the passage does not indicate what is the "most significant" disadvantage of metallic mirrors.
Rather, the point is that, because of the disadvantage of energy loss, such mirrors cannot be used in certain applications.
Eliminate.
(E) Metallic mirrors are unsuitable for applications where it is crucial to minimize energy loss.
This choice nails the main conclusion.
The passage presents and explains the issue that metallic mirrors absorb energy.
It then presents a conclusion that follows from those facts, which is that "metallic mirrors cannot be used in applications in which minimizing energy loss is important."
So, that's the main conclusion, and this choice basically says the same thing.
Keep.
Correct answer E
Which one of the following most accurately expresses the argument's main conclusion?
This question is a specific type of Conclusion question that asks us to find the argument's "main" conclusion. So, the correct answer will not just be a conclusion that follows from the passage. It will state the main point of the passage.
The main point is the final conclusion toward which everything else in the passage leads.
In answering such a question, it's good to be aware that the correct answer may either state an unstated conclusion that follows from everything the passage says or come close to simply repeating a statement in the passage.
(A) Metallic mirrors reduce the effectiveness of high-powered lasers.
This is supported by the statements in the passage.
However, it's not the main conclusion since the point of mentioning lasers is just to provide an example. The main conclusion is a broader point about metallic mirrors in general.
Eliminate.
(B) Part of the light falling on metallic mirrors tends to be absorbed by them.
The passage does say this, but it's not the main point of the passage toward which everything else in the passage leads. It's a supporting fact.
Eliminate.
(C) High-powered lasers require mirrors that conserve energy.
The last sentence of the passage does support this choice.
However, it's not the main conclusion since the point of mentioning lasers is just to provide an example. The main conclusion is a broader point about metallic mirrors in general.
Eliminate.
(D) A tendency to waste energy is the most significant disadvantage of metallic mirrors.
The information presented by the passage does not indicate what is the "most significant" disadvantage of metallic mirrors.
Rather, the point is that, because of the disadvantage of energy loss, such mirrors cannot be used in certain applications.
Eliminate.
(E) Metallic mirrors are unsuitable for applications where it is crucial to minimize energy loss.
This choice nails the main conclusion.
The passage presents and explains the issue that metallic mirrors absorb energy.
It then presents a conclusion that follows from those facts, which is that "metallic mirrors cannot be used in applications in which minimizing energy loss is important."
So, that's the main conclusion, and this choice basically says the same thing.
Keep.
Correct answer E
23 May 2026, 10:15
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Because metallic mirrors absorb some light, they waste energy. When light strikes a metallic mirror, electrons in the mirror move, using energy and dimming the reflected image. As a result, metallic mirrors cannot be used in applications in which minimizing energy loss is important, such as high-powered lasers.
Which one of the following most accurately expresses the argument's main conclusion?
The argument explains why metallic mirrors waste energy: they absorb some light, and electron movement uses energy. The final point is that metallic mirrors should not be used when minimizing energy loss is important. That final practical claim is the main conclusion.
(A) Metallic mirrors reduce the effectiveness of high-powered lasers.
Too narrow. High-powered lasers are given as an example of applications where energy loss matters.
(B) Part of the light falling on metallic mirrors tends to be absorbed by them.
Wrong. This is a premise explaining why metallic mirrors waste energy.
(C) High-powered lasers require mirrors that conserve energy.
Wrong. This is implied by the example, but it is not the argument’s main conclusion.
(D) A tendency to waste energy is the most significant disadvantage of metallic mirrors.
Wrong. The argument says metallic mirrors waste energy, but it does not compare this disadvantage with other possible disadvantages.
(E) Metallic mirrors are unsuitable for applications where it is crucial to minimize energy loss.
Correct. This restates the conclusion: metallic mirrors cannot be used in applications where minimizing energy loss is important, such as high-powered lasers.
Answer: (E)
Which one of the following most accurately expresses the argument's main conclusion?
The argument explains why metallic mirrors waste energy: they absorb some light, and electron movement uses energy. The final point is that metallic mirrors should not be used when minimizing energy loss is important. That final practical claim is the main conclusion.
(A) Metallic mirrors reduce the effectiveness of high-powered lasers.
Too narrow. High-powered lasers are given as an example of applications where energy loss matters.
(B) Part of the light falling on metallic mirrors tends to be absorbed by them.
Wrong. This is a premise explaining why metallic mirrors waste energy.
(C) High-powered lasers require mirrors that conserve energy.
Wrong. This is implied by the example, but it is not the argument’s main conclusion.
(D) A tendency to waste energy is the most significant disadvantage of metallic mirrors.
Wrong. The argument says metallic mirrors waste energy, but it does not compare this disadvantage with other possible disadvantages.
(E) Metallic mirrors are unsuitable for applications where it is crucial to minimize energy loss.
Correct. This restates the conclusion: metallic mirrors cannot be used in applications where minimizing energy loss is important, such as high-powered lasers.
Answer: (E)
