Question

Under which of these conditions will no image be formed (real or virtual) for an object placed in front of a concave mirror? A. The object is placed at the focal point on the principal axis. B. The object is placed at the center of curvature on the principal axis. C. The object is placed between the center of curvature and focal point on the principal axis. D. The object is placed between the focal point and the vertex on the principal axis.
ANSWER IS (A) FOR PLATO USERS

Answer 1

Answer:

A. The object is placed at focal point on the principal axis.

This where no image is formed.

Explanation:

This is because the position of the object is at infinity.So the position of the image will be At the focus where the size of the image will be highly diminished, point-sized.

The nature of the image will be Real and Inverted.

Due to these reasons no image if formed when object is placed on the principal axis.