Identify the type of lens or mirror placed at XY where O is object and I is image. (O is place between pole and focus)

Q. 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) 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.

(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

Q. Question 20
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) 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.

(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.

Q. When an object is placed between the focus and the pole of a concave mirror, the image is .

Q. The position and size of the image formed by a convex lens, when the object is placed between focus ($F_1$) and optical center ($O$), are:

Q. A virtual image is formed if the object is placed between focus and the pole of a concave mirror.