Despite ruining sharpness, what capability of a large ground mirror is unaffected by atmospheric distortion?

Answer

Collecting more light to see fainter objects.

The physical size of the mirror primarily determines its light-gathering power, allowing it to observe fainter targets, even if the atmospheric blur ruins the sharpness of the image.

Despite ruining sharpness, what capability of a large ground mirror is unaffected by atmospheric distortion?
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