Question

an object is placed at infinte distance from a concave mirror of focal lenght15 cm . what would be the object distance for which image is virtual​

Answer 1

Explanation:

We know that virtual and erect image is formed when we place an object within focal length of the mirror. As focal length given = 15 cm. So, object distance must be less than 15 cm out of four given option only one option is correct.

Answer 2

Answer:

as it is a concave mirror for obtaining a virtual and erect  image the object should be placed between pole and focus therefore object should be placed at a distance of less than 15 cm