Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.
a. An Object is placed far away from the device, and a diminished real image is formed on the same side as that of the object.
b. An Object is placed far away from the device, and a diminished real image is formed on the other side as that of the object.
c. 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.
d. Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.
Answer variants:
Convex mirror
Concave lens
Convex lens
Concave mirror