An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of (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: (c). Angular magnification m = (fo)/(fe): needs large fo. Angular resolution RP = (D)/(1.22λ): needs large D. So the answer is (c) large focal length and large diameter.

An astronomical refracting telescope will have large angular… | NEET 2018

Q37NEET 2018Easy

Optical Instruments & the Eye

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

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Answer: (c)

Angular magnification $m = \dfrac{f_o}{f_e}$ : needs large $f_o$ .
Angular resolution $RP = \dfrac{D}{1.22\lambda}$ : needs large $D$ .
So the answer is (c) large focal length and large diameter.

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