Refraction from Flat Surfaces Concept

Demonstrations in Refraction from Flat Surfaces

Single light ray refracting through a tilted rectangular plexiglass block mounted on paper on the blackboard, with ray projector visible at left edge

Blackboard Optics Refraction at Flat Surfaces

Students observe how light rays bend when entering and exiting transparent plexiglass blocks, verifying Snell's Law quantitatively by tracing rays on paper. The setup also demonstrates total internal reflection and …
Semi-circular acrylic block on blackboard optics board with a light ray entering the curved surface along a radius, refracting at the flat surface with a partially reflected ray visible
Safety

Blackboard Optics Semi-Circular Block

Demonstrates Snell's law and total internal reflection using a semi-circular block on the blackboard optics board. Rays directed along radii enter the curved surface at normal incidence (no refraction), isolating …
Side view of Leybold refraction apparatus: lamp housing on stand behind a water-filled glass vessel containing a disk, with red-corded transformer on the bench
Safety

Leybold Refraction Apparatus

Visualizes Snell's Law at a flat water-air interface. The multi-slit diaphragm shows refraction, the critical angle, and total internal reflection simultaneously across a range of incidence angles.
Stainless steel cup shown from the same camera angle: left view shows no coin visible, right view with water added shows the coin at the bottom

Refraction Coin Trick

Demonstrates refraction at a flat water-air interface. A coin hidden below the rim of a cup becomes visible when water is added, showing how Snell's law causes objects to appear …
Transparent acrylic container half-filled with water, with a white plastic meter stick placed diagonally showing a visible bend at the water-air interface

Ruler in Water

A meter stick in water appears bent at the surface, providing a visual introduction to refraction and Snell's Law. Students see that the apparent displacement arises from light bending at …
Multiple rainbow spectra projected on paper mounted to blackboard, showing three bands at different deflection angles and spectral widths; stacked prisms visible at right
Safety

Deflection and Dispersion

Compares deflection and chromatic dispersion across three prism materials (acrylic, glass, ethyl cinnamate). Students learn that deflection angle depends on refractive index while spectral width depends on material dispersion -- …