A spectacular spiral rainbow can be seen in a sugar column. When the polarizer underneath the column is rotated, the spiral rainbow also rotates.
Materials:
- Acrylic tube with sugar solution
- Source of bright, collimated light
- Polarizer
- Black skirt
- Variac
Notes:
- Prepare concentrated sugar solution (about 5kg of cane sugar per 6L of hot water).
- The Variac voltage should not exceed 80V.
- Demo is kept in Thimann Labs 130