A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
A. 1/2
B. 1/4
C. ?2
D. 4
E. ?1/4
Answer: E
Physics & Space Science
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A. true B. false
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A) lead. B) aluminum. C) same on each
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Indicate whether the statement is true or false
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The surface water temperature on a large, deep lake is 3°C. A sensitive temperature probe is lowered several m into the lake. What temperature will the probe record?
A) a temperature warmer than 3°C B) a temperature less than 3°C C) a temperature equal to 3°C
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