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Which Has The Larger Light-Gathering Power?

A. A telescope of 5 cm diameter an focal length of 50 cm B. A telescope of 6 cm diameter and a focal length of 100 cm C. A telescope of 2 cm diameter and focal length of 100 cm D. A telescope of 3 cm diameter and a focal length of 75 cm E. both b and c since they have the same focal length
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B. A telescope of 6 cm diameter and a focal length of 100 cm

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