#  The Spectrum 

 



 ##  

  expand\_more  

 
  

 

### Continuous Spectrum

\[M/L | t+ | ★★★\]   
Spectrum production using prism and carbon arc or slide projector.   
  
\[[In-Depth Description](/presentations/continuous-spectrum)\]

### Spectrum Recombination

\[M/L | t+ | —\]  
A second prism recombines the colors to produce white light; alternatively, colors may be recombined in a glass globe.

### Complementary Spectrum

\[L | t+ | —\]  
A complementary (opaque) slit produces the the complementary colors of the regular spectrum.  
  
\[[In-Depth Description](/presentations/complementary-spectrum)\]

### Ultra-Violet Radiation

\[M/L | t+ | —\]  
Carbon arc with quartz optics and fluoroscopic screen.

### Radiometer

\[M | t+ | ★★\]   
Detection of IR radiation from hair dryer and/or special IR source.   
  
\[[In-Depth Description](/presentations/radiometer)\]

### Infra-Red Radiation

\[M/L | t++ | —\]  
Carbon arc with six thermometers or radiometer positioned through spectrum.

### Infra-Red Projector

\[M | t+ | ★★\]   
Lantern projector with IR transmission filter and heat sensitive liquid crystal screen.   
  
\[[In-Depth Description](/presentations/infra-red-projector)\]

### Infra-Red Beam

\[M | t+ | —\]  
Electric heater with parabolic mirror; a second parabolic mirror focuses IR beam (with flash paper detection).

### LWIR Camera

\[ S|t| ★★★★ \]   
See how objects of different temperature emit different intensities of infra-red radiation.

\[[In-Depth Description](/presentations/lwir-camera)\]

### Land's Retinex Theory Experiment

\[L | t++ | ★★★★\]   
The experiment addresses questions like "Does color inhere in the world, or in the eye?" It is a re-creation of Edwin Land's retinex theory experiment.

\[[In-Depth Description](/presentations/lands-retinex-theory-experiment)\]

### Gray Scale Perception

\[M | t+ | —\]  
A demonstration of eye/brain logic in the perception of gray scales across boundaries using rotating disks and/or cylinders.

### Monochromatic Illumination

\[L | t+ | —\]  
Students are asked to guess the colors of various objects illuminated by monochromatic light from a carbon arc spectrum.

### Color That Isn't There

\[S/M | t+ | —\]  
Subjective colors appear when observing rapidly alternating patterns of black and white on a spinning disk.

### Color Mixing

\[L | t+ | ★★\]  
Additive color mixing with three slide projectors and filters.   
  
\[[In-Depth Description](/presentations/color-mixing)\]

### TV Color Perception

\[L | t++ | ★★★★\]   
RGB additive color mixing shown by magnified phosphor dots of video monitor.   
  
\[[In-Depth Description](/presentations/tv-color-perception)\]

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu