What happens to ray that moves along the principal axis or moves through the centre of curvature ?

What is centre of curvature ?

What happens to a ray travelling parallel to the principal axis ?

The line which passes through the centre of curvature and pole is………

Show the formation of image with a ray diagram, when an object is placed on the principal axis of a concave mirror away from the centre of curvature.

Show the formation of image with a ray diagram when an object is placed on the principal axis of a concave mirror away from the centre of curvature.

Where will the image be formed when we place an object, on the principal axis of a concave mirror at a point between focus and centre of curvature ?