If the image distance is negative, the image formed by a mirror is a(n)
A)
real image.
B)
virtual image.
C)
imaginary image.
D)
positive image.
E)
negative image.
B
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Compound Microscope: The focal lengths of the objective lens and the eyepiece of a microscope are 0.50 cm and 2.0 cm, respectively, and their separation is 6.0 cm when adjusted for minimum eyestrain for a person with a near point of 25.0 cm. If the microscope is focused on a small object, the magnitude of its final overall magnification is closest to
A. 50. B. 100. C. 150. D. 200. E. 250.
The atmosphere of Saturn is composed mostly of:
A) methane and ammonia. B) carbon dioxide and ethane. C) hydrogen and helium. D) hydrogen sulfide and ammonia. E) nitrogen and oxygen.
A magnetic field exerts a force on an electric charge if the charge is
a. positive. b. negative. c. moving. d. stationary. e. any of the above.
If the mass of an object were doubled while its volume remained the same, its density would
A) be half. B) double. C) stay the same. D) be four times as great.