Which spherical mirror has a virtual focus?

The focus of which spherical mirror is virtual ?

Which spherical mirror is called a divergent mirror-concave or convex?

A beam of converging rays from a point source would meet behind spherical mirror at a distance of 40 cm from it. But after reflection from the mirror the beam most at a point 20 cm from mirror. Is the mirror concave or convex? What is its focal length?

The ratio of the focal length of spherical mirror to its radius of curvature is-

The focal-length of a spherical mirror of radius of curvature 20cm is

If a graph is drawn taking x and y as the object distance and the image distance respectively from the focus of a spherical mirror, the graph will be a

When is areal magnification considered in spherical mirrors? What is the expression of areal magnification?

A perticular spherical mirror forms images of the same size when the objects are placed 8 cm and 16 cm from the pole of the mirror. Determine the nature and focal length of the mirror. Also determine the magnification of the image.

Statement I : The formula connecting u,v and f for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature. Statement II : Laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.