question_answer 13)

(a) A giant refracting telescope at an observatoryhas an objective lens of focal length 15m. If aneye-piece of focal length 1.0 cm is used, what isthe angular magnification of the telescope ? (b) If this telescope is used to view the moon, what is the diameter of the image of the moonformed by the objective lens ? The diameterof the moon is and the radius of lunar orbit is  

Answer:

(a) Angular magnification (b) Let D be the diameter of moon's image Then