A real image of a candle formed with a converging lens can be viewed on a screen placed
A. at either focal point of the lens.
B. at a single position determined by the distance of the object and the construction of the lens.
C. anywhere on the side of the lens from which the light emerges.
D. nowhere; that is, it can't be viewed on a screen at all.
Answer: B
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A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2. What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
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What observational evidence do we have that quasars are the centers of very distant galaxies?
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