Pioneer in optics and microscopy.

(physics) An instrument used to measure the refractive index of a liquid, by utilizing the critical angle for total reflection.

Measure of optical material dispersion.

(December 3, 1838 – October 28, 1916) an American meteorologist and advocate of time zones.

Lens system for microscope illumination.

(April 13, 1851 – March 7, 1928) an American surgeon and pioneer radiologist in New York City.

In optics, an Abbe prism, named for its inventor, the German physicist Ernst Abbe, is a type of constant deviation dispersive prism similar to a Pellin–Broca prism.

Abbe Ernst: fictional priest, scientist character.

In optics, the Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects.