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billafin billafin
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A month ago

Which of the following has the most light-gathering power?



a telescope of 5 centimetres diameter and focal length of 50 centimetres



a telescope of 6 centimetres diameter and focal length of 100 centimetres



a telescope of 2 centimetres diameter and focal length of 100 centimetres



a telescope of 3 centimetres diameter and focal length of 75 centimetres

Textbook 
ASTRO

ASTRO


Edition: 3rd
Authors:
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LeonKennedySLeonKennedyS
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A month ago
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billafin Author
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A month ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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Yesterday
Brilliant
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2 hours ago
Smart ... Thanks!
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