Rainbow Concept

Demonstrations in Rainbow

Kodak carousel slide projector on a wooden platform at left, water-filled spherical flask at right, with a rainbow arc visible on a white screen mounted on a ring stand above
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Rainbow

A water-filled spherical flask models a giant raindrop. Students observe rainbow formation through refraction at entry, internal reflection off the back surface, and refraction at exit — with dispersion separating …
CD mounted in finger clamp on optical stand with a fiber optic white light source aimed at the data side, producing a rainbow spectrum and bright specular reflection on the wall behind

CD Rainbow

A CD's data tracks (spaced at) act as a reflection diffraction grating, separating white light into a vivid spectral rainbow on the wall. Students see that periodic structures produce wavelength-dependent …
Small circular acrylic disk on blackboard optics board with white light beam entering from the left, producing a dispersed rainbow spectrum to the upper left and a refracted beam to the upper right
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Blackboard Optics Rainbow

A plexiglass semicircular block or small disk on the blackboard optics board demonstrates dispersion, refraction, and total internal reflection — the three phenomena that produce rainbows in water droplets.