Telescope A has a mirror twice the diameter of telescope B's mirror. How does A's light-gathering power compare to B's?

A. A gathers 1/4th as much light as B does.
B. A gathers 4 times the light that B does.
C. A gathers 1/2 the light that B does.
D. A gathers twice the light that B does.


Answer: B

Physics & Space Science

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