  An achromatic cold-neutron microscope with magnification 4 is demonstrated.
The image-forming optics is composed of nested coaxial mirrors of full figures
of revolution, so-called Wolter optics. The spatial resolution, field of view,
and depth of focus are measured and found consistent with ray-tracing
simulations. Methods of increasing the resolution and magnification are
discussed, as well as the scientific case for the neutron microscope. In
contrast to traditional pinhole-camera neutron imaging, the resolution of the
microscope is determined by the mirrors rather than by the collimation of the
beam, leading to possible dramatic improvements in the signal rate and
resolution.
