eyepiece
目镜,眼镜,目测器,目测
Definitions
- 1
- : the lens or combination of lenses in an optical instrument through which the eye views the image formed by the objective lens or lenses; ocular.
Examples
When astronomers stopped looking through the eyepiece and started focusing on photographic plates instead, the planets became even more obscure.
However, at the long wavelengths of radio light, the dishes of radio telescopes are shiny too, reflecting radio waves from the sky up to a receiver, just as visible light reflects off a telescope’s mirror and into an eyepiece.
Before beginning an exposure the focus is adjusted by means of a high-power positive eyepiece.
Looking through the eyepiece, the young inventor stood as though transfixed.
Beware of the popular error that an object held close in front of a telescope can be seen by an observer at the eyepiece.
Insert the eyepiece micrometer inside the ocular and adjust the stage micrometer on the stage of the microscope.
This is an ordinary eyepiece fitted with an adjustable square diaphragm operated by a lever projecting from the side of the mount.