Quick Answer: The Semi Circular Glass Slab is a transparent glass accessory for ray optics, used to study refraction, Snell’s law, the critical angle and total internal reflection.
Last updated: October 2026
Key Features
Semi-circular shape for tracing light through a curved glass medium.
Light enters through the curved surface with reduced deviation when aligned correctly.
Used to study the angle of incidence, angle of refraction and critical angle.
Shows total internal reflection at a glass-air boundary.
Works with a ray box, laser source, protractor and optical bench setup.
About This Product
Students trace the slab's outline on white paper, direct a narrow ray from a ray box or low-power laser at it, and mark the incident, refracted and emergent rays. Angles are measured with a protractor, and the run is repeated at different incident angles. Increasing the angle gradually lets the class find the critical angle and observe total internal reflection. Export supply of the Semi Circular Glass Slab can be arranged to laboratories and schools in United Arab Emirates, Tunisia, Saudi Arabia, Japan, Saint Lucia and Cyprus.
Frequently Asked Questions
Q1. How is the critical angle studied with this slab? The angle of incidence is increased gradually while the rays are observed and marked. This lets students find the critical angle for glass-air refraction and see total internal reflection.
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