Translations:Adventist Youth Honors Answer Book/Health and Science/Optics/68/en

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The power represents how much bigger an object appears than with the unaided eye. You can also think of how many times closer it appears to be. The diameter lets you know how much light is gathered by the lens. A 50mm objective lens gathers much more light than a 35mm objective lens. Because the amount of light that is gathered increases if we increase the area that the light hits, we can calculate the light gathering of a lens using the area of a circle:

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