Identify the device used (a spherical mirror or lens) in following cases, when the image formed is virtual and erect in each case.
- Object is placed between device and its focus, image formed is enlarged and behind it.
- Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.
- 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.
- Object is placed between infinity and device, image formed is diminished and between pole
and focus, behind it.
Answer:
- Concave mirror
- Convex lens
- Concave lens
- Convex mirror