Answer the questions below:
For each of the following cases, identify the optical device (spherical mirror or lens).
1. Object is placed at the centre of curvature. Image formed at the centre of curvature, same size, and inverted.
2. Object is placed between the focus and device. Image formed is enlarged and behind it.
3. Object is placed between infinity and device. Image formed is diminished and between focus and optical centre on the same side as that of the object.