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level: Materials in Depth

Questions and Answers List

Question	Answer
What type of materials are either amorphous or belong to the cubic crystal system?	Isotropic
What types of materials will always split a ray of light into two rays as it enters the stone?	Anisotropic
The two rays of light that are split when entering an anisotropic stone travel at slightly different ___________ to eachother	speeds
What is the term used to describe a certain direction of propagation through an anisotropic material, where the light waves act as if the material is isotropic?	Optic axes
How would you describe a material with one optic axis?	Uniaxial
How would you describe a material with two optic axes?	Biaxial
What is the term used to describe a ray of light that obeys the laws of refraction when passing through a uniaxial material?	The ordinary ray
What is the term used to describe a ray of light that does not obey the laws of refraction when passing through a uniaxial material?	The extraordinary ray
What are the three Greek letters that signify the three principal vibration directions in biaxial materials?	Alpha, beta and gamma