Optical axis

Optical axis (Like this the lottery く、Optical axis) OpticsAnisotropySo it is double refraction crystal, incidence doing light, it is the direction where light does not divide. Optical axisAlso it is called. When you explain simply, when it passes through the ferrocalcite, in the photograph under, letter is visible doubly, but there to be a direction which becomes unable to be visible doubly, thatOptical axisWith it calls.

Definition

Optical axisOpticsAnisotropy double refraction crystal, refractive index becomes fixed, polarized light has not been done double refraction not to occur, 'Usually the light rayWithAbnormal light rayIt agrees (or, the gap smallest it becomes) it is direction.

Optical axis crystal.Optical axisOne axial crystalWith (uniaxial crystal) it is 1 direction,Biaxial crystalWith (biaxial crystal) it becomes 2 directions.

The substance which is the optical axis

• One axial crystal
  • quartz
  • ferrocalcite

• Biaxial crystal
  • sulphur (rhombic sulphur and monoclinal sulphur)
  • mica

Related item

• double refraction
• refractive index