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.

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Solution

(a) Concave mirror – In a concave mirror, if the object is placed between the mirror and the focus then the image formed is enlarged, erect and virtual.

(b) Convex lens – In a convex lens, if the object is placed between the lens and its focus then the image formed is enlarged, erect, virtual and on the same side as that of the object.

(c) Concave lens - In a concave lens, if the object is placed at infinity, the image formed is highly diminished, virtual, erect and between focus and optical centre on the same side as that of the object.

(d) Convex mirror- In a convex mirror, if the object is placed at infinity, the image formed is highly diminished, virtual, erect and between pole and focus.

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Similar questions

For the object placed between the optical centre and focus of a convex lens, the image is :

(a) real and enlarged

(b) real and diminished

(d) virtual and diminished.

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.

Identify the device used as a spherical mirror or lens in the following cases, when the image formed is virtual and erect in each case:

The object is placed between infinity and device, and an image formed is diminished and between focus and optical center on the same side as that of the object.

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. 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.

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