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Q.

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

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a

small focal length and large diameter

b

large focal length and small diameter

c

large focal length and large diameter

d

small focal length and small diameter

answer is C.

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Detailed Solution

For telescope, angular magnification =f0fe Angular resolution =D1.22λ should be large. So, objective lens should have large focal length (f0) and large diameter D for large angular magnification and high angular resolution.
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