why can we see surface of the moon clearly through a telescope
Answers
Answer: we can not see with eyes only we can see from telescope
Explanation: i hope this helps you
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Like looking at anything in a 6″ diameter telescope, you can see details on the moon that are about 3 microradians or larger in angular size. This is true whether you are looking at the Moon or Mars, or Venus.
You might notice that galaxies look a bit fuzzy. That’s because the cones in the eyes need a lot of light to work well. Galaxies are so dim, you may need to catch them with the rods in your peripheral vision, which will be less resolution. This is why Tim Cole says that you can use 300x magnification with a six inch telescope. It may not be that useful for looking at the Moon, but it helps with galaxies and other dim objects.
It may surprise you to know that you can only resolve two objects more than 1.2 km apart on the Moon with a good 6 inch telescope under optimal conditions. As I have answered many times, you would need a telescope larger than the Chara array along with adaptive optics to resolve the Apollo lunar landing sites.
The average atmospheric seeing is going to be slightly worse than a 6 inch telescope can resolve, so your best results will be on a cold, calm night. This is the reason many amateurs do not get larger than a 6 inch scope. Atmospheric turbulence actually makes a more blurry image in a larger telescope under average conditions. But when the “seeing” is good (in my business, with call this a large “r naut” — the Fried parameter for atmospheric turbulence) a larger telescope can be delightful. What business is that? Adaptive optics.