Circular Barrier

A head-sized circular sheet of metal, painted matte black, is mounted on a foot-long metal rod.

Details

9BB200 - Passive Optical Components

1 unit available to reserve

Instances

Instance #344
G2B20A - Demo West (Duane Physics)
Good - Normal Wear

Used in these demonstrations

Setup with LED spotlight on wooden platform at left, circular mask on ring stand at center, optical cable light source at right, and projection screen showing a cyan shadow (left), yellow shadow (right), and dark overlap where both lights are blocked

Colored Shadow Illusion

Demonstrates that color perception involves neural processing, not just physics. Superimposed white and colored lights create two shadows: one in the color of the colored source, and one that appears …
Two flood lamps with reflective metal housings aimed at a white board, with a circular barrier held on a stick creating overlapping blue and red-orange colored shadows on the screen
Safety

Colored Shadows

Students observe that light travels in straight lines by blocking one of two colored light sources and predicting the resulting shadow colors. The demo builds from simple ray tracing to …
Colored shadows on a projection screen showing three overlapping circles in yellow, cyan, and magenta, with secondary overlaps in red, green, and blue, and a dark center where all three shadows overlap
Safety

Primary Color Floodlights

Demonstrates additive color mixing using red, green, and blue floodlights. Students observe that overlapping primary-colored lights produce secondary colors (cyan, magenta, yellow) and white, contrasting with the subtractive mixing they …
Three overlapping circular shadows on a cyan background, showing yellow, red-orange, blue-lavender, green, cyan, and black regions, with a circular barrier on a stand at right
Safety

Red Without Red

Demonstrates color constancy: the brain's assumption about ambient illumination causes a region lit by only white light to appear vividly red. Students see that perceived color depends on context, not …

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