Question

For what range of object positions does a concave spherical mirror form a real image? What about a convex spherical mirror?

Short answer

No, real image never forms any real image of objects

Step-by-step solution

Virtual image

If the object is placed at a distance of$d_0$from a spherical mirror with a focal length, the distance of image of the object formed by the spherical mirror from the vertex of the spherical mirror is given by:

$d_i=\frac{d_0·f}{d_0-f}$

Now, if$d_i$ is positive and the image is real and if$d_i$ is negative then the image is virtual.

Convex spherical mirror

Now, we know that convex spherical mirror never forms a real image of the object, hence no mater what range of object or positions concave spherical mirror will never form real image.