An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens ofA. Large focal length and large diameterB. Large focal length and small diameterC. small focal length and large diameterD. Small focal length and small diameter

An astronomical refracting telescope will have large angular magnifica

1.	An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens ofA. Large focal length and large diameterB. Large focal length and small diameterC. small focal length and large diameterD. Small focal length and small diameter
Answer» Correct Answer - A For telescope , angular magnification `=(f_(0))/(f_(E))` So, focal length of objective lens should be large . Angular resolution `=(D)/(1.22 lambda)` should be large. So, objective should have large focal length `(f_(0))` and large diameter D.

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An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens ofA. Large focal length and large diameterB. Large focal length and small diameterC. small focal length and large diameterD. Small focal length and small diameter

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