Under such circumstances a dark-field microscope is used. The type of illumination provided by this microscope enables viewing of the desired images. To him goes the credit of developing an ultramicroscope with a dark field illumination. There are other types of microscopes used for various more specialised purposes. The electron microscope is one such instrument.
Acoustics microscopes can give even more minute details.
Objects to be viewed are illuminated by electrons in an electron microscope. Such microscopes have a device that emits electrons, which strike the object to be viewed and thus the image to be seen is created.