Question

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, an image formed is diminished and between pole and focus, behind it.

Answer 1

Step 1: Diagram

Step 2: Explanation of virtual image in the convex mirror

1. The object is $AB$ and the image is $A\text{'}B\text{'}$
2. A convex mirror is a spherical mirror in which the reflective surface is bulged out towards the light source.
3. We know that the image formed through a convex mirror is an upright image.
4. For a convex mirror when the object is placed between infinity and the mirror, the image formed is upright and diminished.
5. In this case, a virtual, erect, and diminished image is formed.
6. This image is formed between the focal point and the optical center.

Hence, the mirror used, in this case, is a convex mirror.