A small telescope has an objective lens of focal length 140 cm and eyepiece of focal length 5.0 cm What is the magnifying power of telescope for viewing distant objects when the telescope is in normal adjustment (ie When the final image is at infinity ).If this telescope is used to view a 100 cm tall tower 3 km away , what is the height of the image of the tower formed by the objective lens ?

Question

$\begin{array}{1 1} 4.7\;cm \\ -4.7\;cm \\ 3.7\;cm \\ -3.7 \;cm \end{array} $