Demonstrates how polarizers block out light and what happens when birefrigent objects get inbetween.
- a bigger, flat light source
- two sheets of polarizers for each student (alternatively only one polarizer for each student and an already polarized light source (eg a computer screen))
- calcite blocks
- other birefrigent objects
- each student can hold his/her polarizer(s) in front of the light source and rotate the polarizer(s). What happens?
- then let them take a biregringent object and put it inbetween the polarizers ... observe what happens. Why?
Peter Evennett, Humberto Ibarra Avila, Britta Schroth-Diez