What will be the image formation by a convex mirror when object is at infinity?  

The correct answer is Virtual and erect.

Key Points

• When an object is at infinity, the light rays coming from the object are considered parallel.
• A convex mirror diverges these parallel rays.
• The diverged rays appear to be coming from a point behind the mirror.
• This point is known as the focal point (F) of the convex mirror.
• The image formed is virtual as it cannot be projected on a screen.
• The image is also erect (upright) and is diminished (smaller in size).
• This type of image formation is useful in applications such as vehicle side mirrors to provide a wider field of view.

 Additional Information

• Virtual and inverted
  • In general, virtual images are upright, not inverted. Therefore, this option is incorrect.
• Real and erect
  • A real image is formed when light rays actually converge at a point. Real images are always inverted in the context of mirrors.
• Real and inverted
  • Real images are indeed inverted, but a convex mirror forms virtual images when the object is at infinity.