The radius of a circle is increased by 5%. The percentage increase of the area is
A. 5%.
B. 10%.
C. 12%.
D. 16%.
B. 10%.
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A nearsighted person wears contact lenses of refractive power -6.0 D. What is his near point?
A. 6.0 cm B. -6.0 cm C. 17 cm D. -17 cm E. -4.0 cm
A camera with a 50.0 mm lens is designed to focus from 1.00 m to infinity. What is the distance of travel of the lens with respect to the film plane over this range of focus?
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A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 30.0 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
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