Which of the following position of object produces a virtual, erected and magnified image of object ?
(a) Object is placed between device and its focus, image formed is enlarged and behind it.
(b) Object is placed between the focus and device, image formed is enlarged and on the same 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.
A virtual, erect and magnified image of an object is to be obtained with a convex lens. For this purpose, the object should be placed : (a) between 2F and infinity (b) between F and optical centre (c) between F and 2F (d) at F
The image formed by a concave mirror is virtual, erect and magnified. The position of object is : (a) at focus (b) between focus and centre of curvature (c) at pole (d) between pole and focus