For a concave mirror, when the object is at the centre of curvature, the place and nature of the image formed is :

1. at focus, real, inverted
2. at focus, virtual, inverted
3. at centre of curvature, real, inverted, diminished
4. at centre of curvature, real, same size as that of the object

A ray either incident from the focus (or converging at the focus), after reflection from a spherical mirror :

1. becomes perpendicular to the principal axis
2. becomes parallel to the principal axis
3. becomes normal to the focus
4. passes through the centre of curvature

For an incident ray directed towards center of curvature of a spherical mirror, the reflected ray:

1. retraces it's path
2. passes through the focus
3. passes through the pole
4. becomes parallel to the principal axis

For a concave mirror, when the object is at focus, the size of the image formed is:

1. magnified
2. highly magnified
3. diminished
4. of the same size