How Many Times More Light Will Be Collected by the Optics

question 230

Multiple Choice

How many times more light will be collected by the optics of one side of a pair of binoculars (7 × 50-magnification of 7 and an objective lens aperture diameter of 50 mm) than by an average human eye, with a typical aperture diameter of 5 mm?

• A) 100 times
• B) 10 times
• C) 2500 times
• D) 7/5, or 1.4 times

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