Quick Answer: The Optical Needle Parallax Pin is a ray optics accessory used as a reference marker to trace light rays, locate images and remove parallax error in experiments with glass slabs, prisms, lenses and mirrors.
Last updated: October 2026
Key Features
Marks incident, refracted and emergent ray directions
Locates image positions by removing parallax
Used with glass slabs, prisms, lenses and plane mirrors
Builds accurate alignment and drawing skills
About This Product
A white sheet is fixed to a drawing board and the optical component placed on it. Two pins are inserted upright to mark the incident ray, and further pins are placed, while viewing through the component, so that all appear in one straight line. The pin positions are marked, the pins removed and counted, and the points joined to draw the ray path. Export supply of the Optical Needle Parallax Pin can be arranged to laboratories and schools in New Zealand, Kyrgyzstan, Japan, Kuwait and Fiji.
Frequently Asked Questions
Q1. How is parallax removed? By viewing through the optical component and adjusting the pins until they appear in one straight line, then checking the alignment carefully before marking their positions.
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