An astronomical telescope has an angular magnification of magnitude 5 for distant object. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length `f_(0)` of the objective and the focal length `f_(0)` of the eyepiece areA. `45cm` and `-9 cm`B. `50 cm` and `10 cm`C. `7.2cm` and `5 cm`D. `30cm` and `6cm`

An astronomical telescope has an angular magnification of magnitude 5

1.	An astronomical telescope has an angular magnification of magnitude 5 for distant object. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length `f_(0)` of the objective and the focal length `f_(0)` of the eyepiece areA. `45cm` and `-9 cm`B. `50 cm` and `10 cm`C. `7.2cm` and `5 cm`D. `30cm` and `6cm`
Answer» Correct Answer - D `m =- 5 =- (f_(0))/(f_(e)) rArr f_(0) = 5f_(e)` `L = f_(0) +f_(e) = 36` `sigma f_(e) = 36 rArr f_(e) 6cm, f_(0)=5f_(e) = 30cm`

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