Question

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

A

Large focal length and large diameter

B

Small focal length and large diameter

C

Small focal length and small diameter

D

Large focal length and small diameter

Medium
NEET

Solution

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Correct option is A)

Angular magnification  = -
Resolution
Hence for an astronomical refracting telescope having larger focal length and larger diameter for large angular magnification and high resolution.

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