Science

What is the opening of a lens, which controls the amount of light?

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What does the first "A" in NASA stand for?
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Which scientific term is defined as a physical particle with a negative charge?
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Which scientific term means "curved inwards"?
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Which substance will have the highest increase in temperature for the same amount of heat?
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What is the main form of energy produced by a laser?
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How many dimes are equal to one pound in weight?
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Which bridge has the longest span in the U.S.?
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Which of the following characteristics is the force of gravity dependent on?
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