The position of the image produced by a concave mirror when an object is placed at a distance such that light rays from the object are parallel to the principal axis is:

Correct option is C

The correct answer is C at the principal focus.

• When an object is placed at a distance such that the light rays from it are parallel to the principal axis, a concave mirror converges these rays to a single point on the principal axis called the principal focus.
• This is a fundamental property of concave mirrors as they are designed to focus parallel light rays at the principal focus.

• Concave mirrors are used in devices like telescopes, headlights, and shaving mirrors for their focusing property.
• The distance from the mirror to the principal focus is called the focal length.
•  Parallel rays to the principal axis always converge at the principal focus after reflection.
•  The position of the image is real and inverted for this case.
•  This property is key to applications requiring light concentration, such as solar cookers.