NEET 2018 Physics question

An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of

(1)Large focal length and large diameterCorrect
(2)Large focal length and small diameter
(3)Small focal length and large diameter
(4)Small focal length and small diameter

Answer: (1)

Solution

Angular magnification of an astronomical telescope in normal adjustment is , so a large magnification needs a large objective focal length . Resolving power (limit of resolution) is

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Question ID VK-092204