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  4. An object is placed at the principal focus of a convex mirror. The image will be at

Q. An object is placed at the principal focus of a convex mirror. The image will be at

 2769  182 KCETKCET 2018Ray Optics and Optical Instruments Report Error

Solution:

Light rays reflected from the mirror neither converge (forming a real image) nor diverge (allowing a virtual image to be seen).
Light rays from any point on the object are reflected so that they are parallel to each other. It’s simply the reverse case of parallel light rays hitting the mirror and forming an image at the principal focus.
When the object is placed at the focus the image is formed at infinity &highly enlarged.