micro-image
/ˈmʌɪkrəʊˌɪmɪdʒ/noun
1A very small image, especially one which can be viewed only by means of magnification; specifically a microphotograph.
2 Astronomy. Each of a set of multiple images of an astronomical object formed by gravitational microlensing.
Origin
1950s; earliest use found in Science. From micro- + image.