School of Physics Lecture Demonstration Manual

Hc-8 Infrared Radiation

Published: Friday 20 April 2007 - Updated: Monday 28 March 2011


To demonstrate that electromagnetic radiation extends beyond the visible into the infrared and its equivalence with heat radiation.



Click on pictures to enlarge.

Infrared Radiation

Infrared radiation


A normal colour spectrum is produced with the aid of the slit and slide projector and the prism. Rotating the prism will bring different sections of the spectrum into the entrance pupil of the thermopile. Maximum reading is obtained just passed the red end of the spectrum. This experiment requires that the infrared filter is removed from the slide projector. NB. plastic slides will melt.

Safety notes

Electrical Safety 

Fire/Burn Safety 


top of page