Quick Answer: Optics Alignment Needle is an optical-bench accessory that gives one narrow, visible reference point for aligning components and locating images by the no-parallax method.
Last updated: October 2026
Key Features
Narrow tip as a single reference point
Mounted vertically on a compatible carrier, base or holder
Used to set components at the height of the lens or mirror centre
No electrical power needed
About This Product
On the bench, the needle tip is set level with the optical centre of the lens or mirror, and the observer moves the needle or viewing point until needle and image show no relative motion, placing them approximately in the same plane. This no-parallax technique makes the needle a routine accessory in Light And Optics focal-length and image-formation work.
Frequently Asked Questions
Q1. What is the no-parallax method? The observer compares an optical image with the reference needle while changing viewing position; when no relative movement is seen, image and needle are approximately in the same plane.
Q2. Is the needle safe for students? For supervised use, yes. The point may be sharp, so it should be handled by the support and capped during transport and storage.
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