For a concave mirror, the position of the image for an object placed at infinity is ________.

Correct option is D

The correct answer is ( d) focus.

• When an object is placed at infinity in front of a concave mirror, the image formed will be located at the focus of the mirror.
• This is because the rays from an object at infinity are parallel to the principal axis and, after reflection from the concave mirror, they converge at the focus.
  

Information Booster

• ​Concave Mirror: Concave mirrors are curved inward, causing parallel rays to converge at the focus after reflection.
  
• Focus: For concave mirrors, the focus is the point where all reflected rays from an object at infinity meet. It is located at a distance equal to the focal length from the mirror.
  
• Applications: Concave mirrors are used in applications like headlights, shaving mirrors, and satellite dishes due to their ability to focus light.