If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to 

a) 
The sum of the focal lengths of the objective and the eyepiece 
b) 
The different of the focal lengths of the two lenses 
c) 
The ratio of the focal length of the objective and eyepiece 
d) 
The ratio of the focal length of the eyepiece and objective 
If both the object and image are at infinite distance from a refracting telescope its magnifying power will be equal to 

a) 
The sum of the focal lengths of the objective and the eyepiece 
b) 
The different of the focal lengths of the two lenses 
c) 
The ratio of the focal length of the objective and eyepiece 
d) 
The ratio of the focal length of the eyepiece and objective 
(c) In case of a telescope if object and final image are at infinity then 