Question

A boy runs from infinity to the pole of a concave mirror. Sort the position of image with the earliest at the top.

• A. At focus
• B. Between C and F
• C. At infinity
• D. Behind the mirror

Answer 1

As the object is at infinity, its highly diminished real image is formed at focus. Further moving towards the pole, the image drifts away from the mirror and magnifies in size. The image moves to somewhere between the C and F, when the object is somewhere beyond 2C. As the object approaches the focus, the image moves to infinity. When the object reaches between the pole and the focus, the image becomes virtual and forms behind the mirror.