IMPORTANT MICROSCOPY TERMS
COATED LENS
In attempting to transmit light through glass, much of the light is lost through reflection.
Coating a lens increases the light transmission by reducing or eliminating reflection, thus
allowing more light to pass through.
COVER SLIP
Thin glass cut in circles, rectangles or squares usually a thickness of 0.15 to 0.17mm, for
covering the slide specimen. The majority of specimens should be protected by a cover
glass, and must be covered when using 40XRD objective.
DEPTH OF FOCUS
The ability of a lens to furnish a distinct image above and below the focal plane. Depth of
focus decreases with the increase of numerical aperture or with the increase of magnification.
EYE POINT OR EYE RELIEF
The distance from the eyepiece lens to your eye where a full field of view can be seen. A higher
eye point accommodates users who wear eyeglasses.
FIELD OF VIEW
The diameter of the intermediate image.
OBJECT FIELD
The area of the object that is seen when the image is observed. It may range in diameter from
several millimeters to less than 0.1mm.
FOCAL LENGTH
Parallel rays of light after refraction through a lens will be brought to a focus at the focal point.
The distance from the optical center of the lens to the focal point is the focal length.
SILVER
3H
SERIES
| 06
SILVER
LINE
