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Q.

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

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a

large focal length and large diameter

b

large focal length and small diameter

c

small focal length and large diameter

d

small focal length and small diameter

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Limit of resolution is 

1.22λD so more the diameter(D) better the resolution

Magnification

M=f0fe so more focal length ensures more magnification

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