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

small focal length and large diameter

b

large focal length and small diameter

c

small focal length and small diameter

d

large focal length and large diameter

answer is D.

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Detailed Solution

Critical angular separation for which two objects are parely resolvable is Resolving Power  Where a = Objective diameter.Also,for telescope,angular magnification α to  Also focal length of objective (fo) α a.Hence option -(4) is right.
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