Question

Mention the types of optically active crystals with example.

Answer 1

1. Uniaxial crystals:
   Crystals like calcite, quartz, tourmaline and ice having only one optic axis are called uniaxial crystals.

2. Biaxial crystals:
   Crystals like mica, topaz, selenite and aragonite having two optic axes are called biaxial crystals.