Lens-Maker Formula: A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
A. infinite
B. 38 cm
C. -30 cm
D. 18 cm
E. -19 cm
Answer: B
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For the typical "household ac voltage" of 120 V, what is the amplitude of the emf?
A. 120 V B. 240 V C. 60.0 V D. 170 V E. 330 V
Optical telescopes are usually used only at night, but radio telescopes can be used day or night
Indicate whether the statement is true or false
Historical records show that there were very few sunspots from about 1645 to 1715, a phenomenon known as the _______________
Fill in the blank(s) with correct word