Question 309: Ray Optics

Question

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

Accepted Answer

For telescope, angular magnification = $${{{f_0}} \over {{f_e}}}$$, which
shows that focal length of objective lens to be large.
Angular resolution = $${D \over {1.22\lambda }}$$ which is large, hence
objective should have large focal length and larger
diameter.

Answer

small focal length and large diameter

Answer

large focal length and small diameter

Answer

large focal length and large diameter

Answer

small focal length and small diameter

Ray Optics

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

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