A carsegrainian telescope user two mirrors such a telescope is built with the mirrors 20 mm apart. If the radius of curvature of large mirror is $220\;mm$ and the small mirror is 140 mm, where will the find image of the object at infinity be ?

Question

$\begin{array}{1 1} \text{31.5 cm to the right of the secondary mirror } \\ \text{31.5 cm to the left of the secondary mirror } \\ \text{31.5 cm to the right of the secondary mirror } \\ \text{31.5 cm to the left of the secondary mirror } \end{array} $