Used with an OHP to display, describe and allow discussion on the visible light spectrum and the role of various coloured filters without requiring mathematical calculations.
A continuous reference spectrum is projected on the OHP screen with the spectrum of the two colour filters in the form of gels being viewed as well.
(i.e the yellow gel overlapping a blue gel is green gives a yellow).
- large piece of holographic diffraction grating,
- slit for the OHP stage,
- more than 30 colored gels,
- 3x special flasks for viewing the transparent colored liquid.