Object is placed between infinity and a device. Image formed is diminished and between pole and focus, behind it. If the image is virtual and erect, identify the device.

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. 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. It is given that the image formed by an optical device is virtual, erect and diminished. Image is formed between the focus and optical centre on the same side as that of the object. Object is placed between infinity and device. Identify the device used.

Q. An object is placed between a device and its focus. The image formed is enlarged and behind it. Identify the device.

Q. Use the mirror equation to deduce that:

A) An object placed between f and 2f of a concave mirror produces a real image beyond 2f.

B) A convex mirror always produces a virtual image independent of the location of the object.

C) The virtual image produced by a convex mirror is always diminished in size and is located between the focus and the pole.

D) An object placed between the pole and focus of a concave mirror produces a virtual and enlarged image.