Thin Lenses: Which statement about a single thin lens is correct?
A. A converging lens always produces a real inverted image.
B. A diverging lens always produces a virtual inverted image.
C. A converging lens sometimes produces a real upright image.
D. A diverging lens always produces a virtual upright image.
E. A diverging lens produces a virtual upright image only if the object is located between the lens and its focal point.
Answer: D
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Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy. b. is the process by which hydrogen and helium are converted into heavier elements. c. describes the structure of a globular cluster. d. describes how the magnetic field of the galaxy traps cosmic rays. e. describes the method by which neutral hydrogen produces 21-cm radiation.
If the Moon was twice as far away from the Earth as it is currently what would happen to total solar eclipses?
We would have more total solar eclipses. Nothing would change. We would have no total solar eclipses. We would have a total solar eclipse every two years.
A large piece of debris that only partially burns up in the atmosphere, leaving a fragment to hit the surface, is called a
A) meteor B) hail stone C) meteorite D) meteoroid
A violinist discovers while tuning her violin that her string is flat (has a lower frequency). She should
A. tighten the string. B. loosen the string. C. play faster.