An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, this second lens having a focal length of 8.0 cm. The final image
A)
is virtual and upright.
B)
is real and upright.
C)
is virtual and inverted.
D)
is real and inverted.
E)
cannot be determined with the information given.
B
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Compound Microscope: A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective. How far apart are the lenses?
A. 20 mm B. 21 mm C. 23 mm D. 41 mm
An airplane is traveling in level flight at a constant velocity. L is the lift, W is the weight, T is the thrust, and D is the drag. Which of the diagrams is the correct free body force diagram for the airplane?
A. Figure 1
B. Figure 2
C. Figure 3
D. Figure 4
E. Figure 5
What is spectroscopy?
A) An analysis of the way in which atoms absorb and emit light B) A study of the geometry of rainbows C) An observational technique to measure the brightness of light at different colors D) The use of CCDs to capture light more efficiently than with photographic film E) A method to freeze atmospheric turbulence for better resolution
The primary source of the energy radiated by a star, such as the sun, is
A) fusion reactions in which helium is fused to form iron. B) fusion reactions in which hydrogen is fused to form helium. C) beta decay. D) fission reactions involving uranium. E) alpha decay.