There are two optical telescopes operating at the exact same frequency.
The first telescope is a 10 m telescope that is planned to be located at the L2 Lagrangian point 1.5 million kilometers past the orbit of the Earth. The second telescope is a 2 m telescope that is planned to be placed on the far side of the moon (average distance to the moon is 380,000 km from the Earth..
Which of the two telescopes will have the greater light gathering power (10 m or 2 m)?