A card sheet divided into squares each of size $1\; mm^2$ is being viewed at a distance of 9 cm through a magnifying glass (a converging lens of focal length 10 cm) held . close to the eye. What is the angular magnification produced by the lens ?

Question

$\begin{array}{1 1} 2.8 \\ -2.8 \\ 1.8 \\ -1.8 \end{array}$