Square interference filter

A Square Interference Filter for Precise Spectral Observations

The square interference filter is designed for physics lab work in high school. It allows the selection of a narrow wavelength band and effectively eliminates stray radiation, enabling clear observations during spectroscopy experiments.

With its dimensions of 25 x 25 mm and a thickness of 3 mm, this multilayer filter easily fits into slide holders. 

Used in conjunction with a suitable light source, this filter is a practical tool to illustrate the concept of the spectrum and to deepen the study of light in class.