The focus of a concave mirror is a point on the …………… through which the light rays incident …………… to the principal axis pass after reflection from the mirror.

1. centre of curvature, perpendicular
2. principal axis, parallel
3. principal axis, perpendicular
4. aperture, parallel

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 infinity, the nature of the image formed at focus is

1. virtual, inverted
2. virtual, diminished to a point
3. real, enlarged, inverted
4. real, inverted, diminished to a point

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