Write the word or phrase that best completes each statement or answers the question. -A zoom lens for a camera is adjusted to change its focal length from 38 mm to

Write the word or phrase that best completes each statement or answers the question.
-A zoom lens for a camera is adjusted to change its focal length from 38 mm to 304 mm. If
the same amount of light is to be admitted to the lens in both cases, what is the final
f-number if the original f-number was f/2.0?

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