Quick Answer:The Glass Slab is a rectangular block of optical glass with precision-parallel faces, all sides polished and bevelled safety edges, used to study refraction, lateral displacement and apparent depth.
Last updated: 18 October 2026
Key Features
Rectangular block with precision-parallel faces.
All sides optically polished.
Bevelled edges to prevent chipping.
For refractive index, lateral shift and apparent depth experiments.
Technical Specifications
Specification
Value
Shape
Rectangular, parallel faces
Finish
All sides optically polished
Edges
Bevelled safety edges
How It Is Used
The slab is laid on paper and its outline drawn. Using optical pins or a ray box, students trace a ray through it, measure the angles of incidence and refraction to find the refractive index, and measure how far the emerging ray is shifted sideways. Viewing a mark through the slab shows apparent depth.