which of the following binoculars would be best for observing very faint comets

Question

which of the following binoculars would be best for observing very faint comets among the stars? why?
Explain the answer
a. 8x50
b. 5x20
c. 10x35
d. 12x50
e. 7x60

rays that pas through a pens very close to the lens axis are more sharply focused than those that are very far from the axis. the inability of a lens to sharply focus off axis rays is called spherical aberration. this effect helps us to understand why

a. we become more nearsighted as we grow older
b. we become more farsighted as we grow older
c. we can see only in black and white in dim light
d. it is easier to read in bright light than in dim light
e. a moving object is more readily detected than a stationary one.

Explanation / Answer

d. 12x50e. a moving object is more readily detected than a stationary one.

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