The angular magnification of a refracting telescope is 40 x. When ...

[genevieve1028]

The angular magnification of a refracting telescope is 40 x. When the object and final image are both at infinity, the distance between the eyepiece and the objective is 143.5 cm.
 
  The telescope is used to view a distant radio tower. The real image of the tower, formed by the objective, is 6.0 mm in height. The focal point of the eyepiece is positioned at the real image. What is the angle subtended by the final image of the tower.
  A) 0.15 rad
  B) 0.17 rad
  C) 0.19 rad
  D) 0.21 rad
  E) 0.23 rad

Question 2

The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity.
 
  The diameter of Neptune is 4.96  107 m and the distance from the earth at the time of observation is 4.4  1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune?
  A) 0.90 mrad
  B) 1.1 mrad
  C) 1.3 mrad
  D) 1.5 mrad
  E) 1.7 mrad

[mmpiza]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: A