Optical reticles are also known as reticle patterns. They are used in optical systems to provide measuring, aligning, or targeting for reference. Usually we could find them in the optical devices, such as microscopes, telescopes, and rifle scopes. Their role is to measure and observe more accurately and precisely.
Optical reticles are typically placed in the focal plane of the optical system, where they can be viewed by the user. When light enters into the optical system, it is focused onto the reticle, which appears as an overlay on the image. And then the users can begin to measure or align depending on the reticle patterns as for reference.
Optical reticles can be designed variously on different applications. Multiple lines, dots, circles, or other shapes all can be etched on the galss base. Sometimes, some reticles are illuminated with a light source to enhance visibility in low-light conditions.
The most common reticle type is the crosshair reticle. There are two perpendicular lines that intersect at the center of the field of view in such crosshair reticles. Crosshair reticles are often used in rifle scopes to aid in aiming and targeting.
Of course, exact and appropriate choice is decided by actual application and optical system.
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