A lens is used as a magnifier. Which of the following statements is incorrect?
a. The focal length of the lens must be negative.
b. The magnification is greatest when the eye focuses at the near point.
c. The refractive power of the lens is positive.
d. The lens is convex.
A
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Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. What are the frequencies of visible light?
a. 
b. 
c. 
d. 
The ____________ of a planet is the region around the planet where the magnetic field is able to deflect the solar wind and other charged particles
a. aurora b. magnetosphere c. hydrosphere d. corona e. Schwarzschild radius
Venus rotates so rapidly that the dominant form of atmospheric circulation is powered by
a. winds moving from its equator to its poles. b. heated air escaping from its volcanoes moving along the equator. c. winds moving from its poles to its equator. d. heated air escaping from active tectonic plates.
Shown following are three terrestrial planets of our solar system. Rank the planets based on the amount of time the surface of the planet has had a moderate to high level of volcanic/tectonic activity, from longest to shortest.
