optical wedge

'optical wedge' can also refer to...


More Like This

Show all results sharing this subject:

  • Astronomy and Astrophysics


Show Summary Details

Quick Reference

A strip of glass or other transparent material whose light transmission decreases evenly from one end to the other. The change in light transmission is accomplished by applying a coating whose thickness increases along the wedge, or by an increase in photographic density. The wedge is used at the eyepiece to reduce the intensity of a star in the field of view until it appears the same brightness as another, fainter, comparison star. The magnitude difference between the stars can then be measured.

Subjects: Astronomy and Astrophysics.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.