Microscope components

thumb|right|250px|A collection of different types of eyepieces.

optical instrument corrected for dispersion at 2 wavelengths

electrical component producing a narrow collimated electron beam

optical element that gathers light from the object being observed and focuses the light rays to produce a real image

thumb|270px|right|Chromatic aberration of a single lens causes different wavelengths of light to have differing focal lengths. An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses.

lens, mirror or mirror-lens optical system

technique used to increase the resolving power of a microscope

optical lens