Which one among the following is the major cause of blurring and unsharp images of objects observe through very large telescope at the extreme limit of magnification?

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Which one among the following is the major cause of blurring and unsharp images of objects observe through very large telescope at the extreme limit of magnification?

Poor optical polish achievable on large mirrors

Air turbulence of earths atmosphere

Varying density of air in the Earths atmosphere

Poor tracking capacities of telescopes