A gravitational lens occurs when
A) a massive object bends light beams that are passing nearby.
B) a massive object causes more distant objects to appear much larger than they should, and we can observe the distant objects with better resolution.
C) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
D) a telescope lens is distorted by gravity.
Correct Answer:
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