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5 terms
Photonics Dictionary: D
Clear All Filters x
eyepiece x
D x
dichroscopic eyepiece
An eyepiece used in a polariscope or polarizing microscope to give a comparison view of the same object under illumination by the two complementary rays of polarized light.
diopter movement
The adjustment of the eyepiece of an instrument to provide accommodation for the eyesight differences of individual observers. The axial distance through which the eyepiece must be moved, to provide...
diopter scale
A scale located on the eyepiece focusing screw and used to measure the amount of defocusing of the eyepiece in diopters. The reciprocal of the image distance in meters is a measure of the amount of...
dioptometer
A telescopic system having an eyepiece, a reticle and an objective. The instrument measures wavefront power in diopters.
distance of distinct vision
The near-point distance of the normal eye. The value of 10 in. or 25 cm is normal. This value is used in evaluating the designated magnification of a simple magnifier or eyepiece.
Photonics Dictionary
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