The diagram given below shows an object $O$ and its image $I$.Without actually drawing the ray diagram, state the following :(i) Type of lens (Converging/Diverging)(ii) Name two optical instruments where such an image is obtained.(iii) List three characteristics of the image formed if this lens is replaced by a concave mirror of focal length ' $f$ ' and an object is placed at a distance ' $\frac{f}{2}$ ' in front of the mirror.