A thin lens of focal length 12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where will the image be formed?

A. 2.5 cm behind the lens
B. 5.6 cm behind the lens
C. 5.6 cm in front of the lens
D. 50 cm behind the lens
E. 50 cm in front of the lens


E. 50 cm in front of the lens

Physics & Space Science

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In an ac circuit, the current in an inductor

A. leads the voltage by 90
B. lags the voltage by 90
C. is in phase with the voltage.
D. leads the voltage byradians.
E. lags the voltage byradians.

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An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?

a. 1 b. 2 c. 1/2 d. 1/4 e. ?2

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Which star has the largest proper motion? Why?

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Two parallel surfaces are separated by 1 m. One of the surfaces has a temperature of 177ºC and the other surface is 27ºC. A heat shield is placed midway between the two surfaces. Estimate the shield temperature.

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Physics & Space Science